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14 Jul 2003, 13:16
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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
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.
-----
from techinterview.org
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
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14 Jul 2003, 14:08
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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? (reasonable one solvable with the information given is "how far away is the train and how fast is it going relative to the man?")
Archived Topic
Hi there,
This topic has been closed and archived due to inactivity or violation of community quality standards. No more replies are possible here.
Where to now? Join ongoing discussions on thousands of quality questions in our Quantitative Questions Forum
Still interested in this question? Check out the "Best Topics" block above for a better discussion on this exact question, as well as several more related questions.
Thank you for understanding, and happy exploring!
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