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A man needs to go through a train tunnel. he starts through

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A man needs to go through a train tunnel. he starts through [#permalink]  14 Jul 2003, 12:16
Expert's post
A man needs to go through a train tunnel. he starts through the tunnel and when he gets 1/4 the way through the tunnel, he hears the train whistle behind him. you don't know how far away the train is, or how fast it is going, (or how fast he is going). all you know is that

if the man turns around and runs back the way he came, he will just barely make it out of the tunnel alive before the train hits him.
if the man keeps running through the tunnel, he will also just barely make it out of the tunnel alive before the train hits him.
assume the man runs the same speed whether he goes back to the start or continues on through the tunnel. also assume that he accelerates to his top speed instantaneously. assume the train misses him by an infintisimal amount and all those other reasonable assumptions that go along with puzzles like this so that some wanker doesn't say the problem isn't well defined.

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from techinterview.org
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Kudos [?]: 48 [0], given: 0

This is an interesting problem and you've done a good job of wanker-proofing it. Now, what exactly is the question you want answered? <grin>(reasonable one solvable with the information given is "how far away is the train and how fast is it going relative to the man?")
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AkamaiBrah
Former Senior Instructor, Manhattan GMAT and VeritasPrep
Vice President, Midtown NYC Investment Bank, Structured Finance IT
MFE, Haas School of Business, UC Berkeley, Class of 2005
MBA, Anderson School of Management, UCLA, Class of 1993

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