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Light at the end of the tunnel (Posted on 2002-05-26) Difficulty: 3 of 5
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)

Comments: ( You must be logged in to post comments.)
  Subject Author Date
SolutionPuzzle SolutionK Sengupta2008-11-18 23:57:34
AnswerK Sengupta2008-11-17 23:50:33
Solutionsalil2006-02-25 12:13:01
SolutionAlgebraic Solutionlmnop2005-01-17 22:24:45
SolutionSolution... I thinkLewis2003-06-03 06:26:20
re: re: Kind of answerDulanjana2002-06-02 06:54:49
re: Kind of answerlevik2002-05-31 23:09:35
Kind of answerDulanjana2002-05-29 06:07:41
answer?orlando2002-05-28 07:35:32
1/2 * X = 1... X=2Carey2002-05-27 23:13:20
SolutionAndrew2002-05-26 16:04:42
SolutionStraight Question and AnswerTomM2002-05-26 15:36:03
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