A passenger train moving at 36 m/sec crosses a person walking in the opposite direction with a speed of 4 m/sec in 10 seconds. The length (in meters) of the train is
Relative speed of the person with respect to train = 36 + 4 = 40 m/sec
Time = 10 sec
$$\therefore\ $$Length of the train = Distance covered = Speed x Time = 40 x 10 = 400 m
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