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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: ( Back to comment list | You must be logged in to post comments.)
Answer | Comment 11 of 12 |
The speed of the train is 14 miles per hour.

Edited on November 18, 2008, 11:58 pm
  Posted by K Sengupta on 2008-11-17 23:50:33

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