a person is running parallel to a railway line at a speed of 15 km per hour a train travelling in the opposite direction at a speed of 66 km per hour takes 14 seconds to cross M find the length of the train
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relative speed = 15+66 = 81km/ he
81*5/18 = 45/2
length of train = relative speed * time
length of speed = 45/2 * 14
= 315 m
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