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 Light at the end of the tunnel (Posted on 2002-05-26)
A man was walking through a tunnel. He is 1/4 of the way through when he hears a train approaching the tunnel from behind him.

If he turns and runs back, he will make it out of the tunnel just as the train is entering it (and will save himself by a hair). If he goes forward to the far end of the tunnel, he will also just barely make it, emerging from the tunnel just as the train is about to catch up to him.

If the man's running speed is 7 miles per hour, how fast is the train moving?

(from techInterview.org)

 See The Solution Submitted by levik Rating: 3.5000 (14 votes)

 Subject Author Date Puzzle Solution K Sengupta 2008-11-18 23:57:34 Answer K Sengupta 2008-11-17 23:50:33 Solution salil 2006-02-25 12:13:01 Algebraic Solution lmnop 2005-01-17 22:24:45 Solution... I think Lewis 2003-06-03 06:26:20 re: re: Kind of answer Dulanjana 2002-06-02 06:54:49 re: Kind of answer levik 2002-05-31 23:09:35 Kind of answer Dulanjana 2002-05-29 06:07:41 answer? orlando 2002-05-28 07:35:32 1/2 * X = 1... X=2 Carey 2002-05-27 23:13:20 Solution Andrew 2002-05-26 16:04:42 Straight Question and Answer TomM 2002-05-26 15:36:03

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