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It does make a difference. All of the information is there, as they say. I guarantee you. No, it's not a trick.
Same question: A man is quarter of the way through a tunnel. He hears a train behind him. If he runs straight ahead, he'll get out the other end of the tunnel just in time, and if he runs back to the start he'll get out just in time. The train is travelling at 20 miles per hour. How fast does the man run?
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