A train travelling at 72 km/hr crosses an another train having half its length and travelling in opposite direction at 63 km/hr in 15 seconds. Faster train also passed a railway platform in 50 seconds. Length of smaller train is what percent of length of platform?
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When two train passes a moving object (having some length) in the opposite direction
Let length of faster train be l meters and length of slower train be m meters
Let the speed of faster train be x km/hr
Relative speed = (x + y) km/hr.
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