this is an easy one.
oops, i didnt notice that this question as already been beaten to death. sorry folks!
correct answer...what do it mean 'beaten to death'
Correct, but overly complicated. We know that a man can run 1/4 of a tunnel before the train enters it (that's what happens if he runs back). So if he runs forward, he'll be at 1/2 of the tunnel when the train enters. He will then run half a tunnel in a same time that it takes a train to go the whole tunnel. The man runs at 1/2 of the speed of the train.
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