a train 200 metres long 72/5 seconds to cross a man walking at rate 5km/hr in opposite direction of train. find speed of train.
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Answer:
D = 200m
T = 72/5 sec
S = 200*5/72 = 125/4 m/s = 125/4*18/5 = 225/2 = 112.5km/h
Speed of train = 112.5-5 = 107.5km/h (Ans)
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