Question

850 metres long train crosses a man who is moving in the same direction with a certain speed, in 50 seconds. If the same train can cross a tree in 20 seconds with the same speed, then find the speed of the man.

A 22.5 m/sec
B 29.5 m/sec
C 25.5 m/sec
D 21.5 m/sec
E None of these
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