There are four people who need to cross a rickety bridge in 17 minutes. The bridge is only strong enough to support two people at a time. Crossing the bridge is a full color book combining original art with poignant words. By the professors calculations, the zombies will catch up to you in just over 17 minutes, so you only have that much time. Most people want to pair slow with fast, or put two slows together but the key to solving it is actually pairing the two fastest. You need to get everybody to the other side in under 17. Taking that internship in a remote mountain lab might not have been the best idea.
Crossing the bridge the hearts of men book 5 and millions of other books are available for amazon kindle. Youve gotten a headstart, but theres only one way to safety. By the professors calculations, the zombies will catch up to you in just over 17 minutes. They need to cross the gorge before the zombies arrive cross completely, then destroy the bridge. Nov 10, 2016 the lab assistant is a bit slower, and it takes her 2 minutes to cross the bridge.
Sep 03, 2015 person a can get across in one minute, person b does it in two minutes, person c crosses in five, and slowpoke sloth human needs 10 minutes. Crossing a bridge anastasia original broadway cast recording. Taking that internship in a remote mountain lab might not have been the best idea pulling that lever with the skull symbol just to see what it did probably wasnt so smart, either, but now is not the time for regrets because you need to get away from these mutant zombies fast. The bridge had become weak and it could only accommodate two people at a time. So you only have that much time to get everyone across and cut the ropes. A young boy needs to cross a bridge that can only hold 100 pounds of weight. Their search for love makes crossing the bridge a compelling read.
Crossing the river in minimum time puzzle genius puzzles. Jan 05, 2010 michael baron reveals his characters secrets in ways that make us care about them. The bridge and torch problem also known as the midnight train and dangerous crossing is a logic puzzle that deals with four people, a bridge and a torch. The bridge can only hold two or less people at any time and they only have one flashlight so they must travel together or alone. We have a whole family out on a picnic on one side of the river. Can you solve this classic riddle about crossing a bridge. The 17minute crossing puzzle 4 people are escaping from zombies or whatever. The flashlight can only travel with a person so every time it crosses the bridge it must be carried back. Person a can cross the bridge in 1 minute, b in 2 minutes, c in 5 minutes, and d in 8. The problem is that its dark and so they cannot cross the bridge without a flashlight read more. When two people cross the bridge together, they must move at the slower persons pace. With the liars and truth tellers its asking one what the other would say.
The chicken and the bag of corn cannot be left alone. Someone must always bring the lantern back to the people who havent crossed the bridge yet, so that when they cross, they dont fall through the holes in the bridge. Jim needs 1 minute, jeanne needs 2 minutes, louis needs 5 minutes and anne needs. Cross a rope bridge in 17 minutes the engineering daily. Bridge crossings is one of the more popular puzzles. Same thing with the limitedtime lights and twopeopleattimeoverabridge thing. They have one torch and, because its night, the torch has to be used when crossing the bridge. Because they are in a rush and the light is fading they must cross in the minimum time possible and must carry a torch.
The guard comes out of his post every 6 minutes and looks down the bridge for any people trying to leave, and at all other times he sits in his post and snoozes. Unfortunately, they have only one torch and the bridge is too dangerous to cross without one. Strategy 1 solves the original problem in 17 minutes. Can you use math to get you and your friends over the bridge before. It is dark hence a lantern must be carried when crossing the. The interactivity below allows you to alter the speeds of the walkers. The bridge can only hold two or less people at any time and they only have one flashlight so they must travel together or. Torsten sillke1 has explored the history of the problem and collected his ndings and references on his web page 7. The lab assistant is a bit slower, and it takes her 2 minutes to cross the bridge. The analyst can cross in 1 minute, the associate can cross in 2 minutes, the vp can cross in 5 minutes and the md takes 10 minutes to cross. Person a can cross the bridge in 1 minute, b in 2 minutes, c in 5 minutes, and d in 8 minutes.
Puzzleslogic puzzlesbridge crossingmonks and cannibals. Because of the varying size of their instruments, it takes each member a different amount of time to cro. Jan 29, 2010 a group of 4 people has to cross a bridge. Here are the puzzles of the bridge crossing puzzles. Tagged bridge, easy, interview, puzzle, torch, tricky. This one is a bit of tricky river crossing puzzle than you might have solved till now. First one took only a minute, second one took 2 minutes, third one took 5 minutes and the last one took 10 minutes. The zombies arrive in 17 minutes, and the bridge can only hold two people at a time. Everyone has to get across to the other side before that. On the surface, this is a simple childrens game however there is a layer of complexity within. Or even help them get across or put up lights on the bridge. Nov 05, 2007 they have only one flashlight and 17 minutes to get there. River crossing team puzzle classic group problemsolving.
Larry then returns with the flashlight, a total of 20 minutes have passed and you have failed the mission. The young boy needs to get across the bridge with all the balls at the exact same time. Puzzleslogic puzzlesbridge crossing wikibooks, open. Riddle bridge, spanning gasconada river, dixon, pulaski. Bridge crossing game puzzle a day a new puzzle, riddle.
For this problem solving job interview question, there is an actual mathematical answer, however the interviewer will want to evaluate your thinking process. You can dash across in a minute, while the lab assistant takes two minutes. It is one of the category of river crossing puzzles, where a number of objects must move across a river, with some constraints. In general the largest problem slowest people should always be put together, and sufficient trips of the fastest made to be able to bring the light back each. The professor takes a whole 10 minutes, holding onto the ropes every step of the way. The rowboat can only carry one person and one item at any point in time. Using a small rowboat, how can they transport a chicken, a fox and a bag of corn to the other side of the river in as few moves as possible. They have seventeen minutes to cross the bridge and for all of them to make it to the concert on time. The bridge is weak and only able to carry the weight of two of them at a time. The puzzle is known to have appeared as early as 1981, in the book. Person a can get across in one minute, person b does it in two minutes, person c crosses in five, and slowpoke sloth human needs 10 minutes. Because they are in a rush and the light is fading they must cross in the minimum time possible and must carry a torch flashlight, on each crossing. Bridgecrossing puzzle, the bridge puzzle, the four men puzzle, the flashlight puzzle, or the bridge and torch problem.
Test your intelligence with this classic bridgecrossing riddle. The four people can cross the bridge at the rate of 1, 2, 5, and 10 minutes, each way. There are more brainteasers about crossing rivers than you. The janitor managed to twist his ankle coming down the hill, so it will take him 5 minutes to cross. There is a narrow bridge, but it can only hold two people at a time. If one book is the 4th from the left and 6th from the right, how many books are on the shelf. Ted translators ted books ted institute the audacious project. Now minutes have passed and there are only 4 minutes left and you are on the wrong side. The bridge will be destroyed by a bomb in 17 minutes. It is one of the category of river crossing puzzles, where a number of objects. One can cross the bridge in 1 minute, another in 2 minutes, the third in 5 minutes, and the slow poke takes 10 minutes to cross. People cant cross the bridge without carrying a flashlight. Next, the professor and the janitor cross the bridge in 10 minutes. Test your intelligence with this classic bridgecrossing.
The bridge must be crossed with the flashlight and can only support two bankers at a time. The bridge is not long, moore takes 1 minute, pruden being last holds the torch in front of himself for the others,he only has to wait until jackson completes the crossing 2 minutes before he, pruden, starts his ten minute crossing. The bridge and torch problem is a logic puzzle that deals with four people, a bridge and a torch. Crossing the bridge was slow movingalmost tedious with its detail at times, but i liked it.
Jan 01, 2010 crossing the bridge was slow movingalmost tedious with its detail at times, but i liked it. Person a can get across in one minute, person b in two minutes, person c in five, and person d, who. There are crocodiles in the gorge or at any rate, its very deep. You must not finish this until you have crossed the bridge. Four people on a rickety bridge my tech interviews. Jim, jeanne, louis and anne wants to cross the bridge at night.
Now the lab assistant grabs the lamp and return backs to you in 2 minutes. Jul 23, 2007 the bridge is not long, moore takes 1 minute, pruden being last holds the torch in front of himself for the others,he only has to wait until jackson completes the crossing 2 minutes before he, pruden, starts his ten minute crossing. The young boy also has 3 balls that each weigh 1 pound each. Free shipping get free shipping free 58 day shipping within the u. The way to cross the bridge without exceeding the 100 lb limit is as follows.
The 17 minute crossing puzzle 4 people are escaping from zombies or whatever. And the professor is an hunched old man with arthritisit takes him a full 10 minutes to cross the bridge. In answering the interview question, the lead up to your answer will be just as important as the actual answer itself. Puzzleslogic puzzlesbridge crossing wikibooks, open books. Riddle bridge, spanning gasconada river, dixon, pulaski county, mo. How do you get everyone across the bridge to safety in 17 minutes or less.
It takes different time for the people in the group to cross the bridge. In addition, since it is pitch black out and there is only one lantern between the four people, anybody crossing the bridge must carry the lantern or if two people are. Four investment bankers need to cross a bridge at night to. If two people are crossing the bridge together, it will take both of them the time that it takes the slower person to cross. Annie crosses the bridge in 1 minute bob crosses the bridge in 2 minutes sherlock holmes crosses the bridge in 5. The janitor is a bit slower and needs five minutes, and the professor takes a whole ten minutes, holding onto the ropes every step of the way.
If 2 people are crossing the bridge at the same time, their speed is equal to the slower ones speed. Since the torch is a necessity and the bride cant hold more than two persons at a time, two persons must travel at a time out of which one must return with the torch so they dont risk their life crossing in the dark. An interesting puzzle where 4 people must cross a bridge in 17 minutes. Sep 12, 2015 four people need to get to the other side of a bridge in 17 minutes before it collapses. They decide to take a shortcut, but must cross a bridge. Not all people take the same time to cross the bridge. Four people need to cross a rickety bridge at night. There are two optimal strategies for solving this type of problem. The four people take different time to cross the bridge 1 min, 2 min, 7 min and 10 min.
The bridge broke down and all they have is a boat that can take them towards the other side of the river. Four people need to cross a bridge in 17 minutes in the middle of the night. Sep 01, 2015 taking that internship in a remote mountain lab might not have been the best idea. You know you can sneak past him when hes sleeping, but the problem is that you wont be able to make it all the way to the other side of the bridge before he sees you since he comes. Because of the varying size of their instruments, it takes each member a different amount of time to cross the bridge it takes the first person one minute, the second person two minutes, the third person five minutes and the fourth person ten minutes. It was a book i could, set down for awhile and come back to. Each person can cross the bridge at a different rate. Four members of a band are walking to a night concert. Puzzleslogic puzzlesbridge crossingsheep, dog and cabbage. Crossing the bridge puzzle bridge and torch problem. Because of its dilapidated condition, the bridge can only support up to 2 people at any given time. The bridge is too dangerous to cross without a flashlight, and its only strong enough to support two people at any given time. U2 has a concert that starts in 17 minutes and they must all cross a bridge to get there.
Four people need to get to the other side of a bridge in 17 minutes before it collapses. No more than 2 people can cross the bridge simultaneously, and the group has only one flashlight. Jan 14, 2011 crossing the bridge is a full color book combining original art with poignant words. The four people took different times to cross the bridge. Pulling that lever with the skull symbol just to see what it did probably wasnt so smart either. If the flashlight has only 17 minutes to hold, then how would they walk home if they used it all up for crossing the bridge. The slow pace also lent itself to the feel of the story. A hiker comes across an intersection where three roads cross. The interactive bridge crossing game has the goal of the player making all of the people cross the bridge. It is dark, and they have to light the path with a flashlight. You must take into account the additional time it will take for them to cross back. It is a dark night and there is only one torch between them.
It takes respectively 1, 2, 5 and 10 minutes for those people to cross the bridge. Ann pearlman, author of the christmas cookie club and infidelity mr. The family includes mother and father, two sons, two daughters, a maid and a dog. According to puzzle book author carl proujan, this one was a favorite of. A brain teaser which test your skills in figuring out a way for four people to cross a rickety bridge in exactly or under 17 minutes. Experiment with different speeds and find the fastest crossing times. The problem is that its dark and so they cannot cross the bridge without a flashlight. They have only one flashlight and 17 minutes to get there.
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