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A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The length of the platform is ?->(Show Answer!)
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1. A train travelling at 48 kmph completely crosses another train having half its length and travelling in opposite direction at 42 kmph, in 12 seconds. It also passes a railway platform in 45 seconds. The length of the platform is





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  • By: guest on 01 Jun 2017 05.48 pm
    Let the length of the first train be x metres. Then, the length of the second train is x metres. 2 Relative speed = (48 + 42) kmph = 90 x 5 m/sec = 25 m/sec. 18 [x + (x/2)] = 12 or 3x = 300     or     x = 200. 25 2 Length of first train = 200 m. Let the length of platform be y metres. Speed of the first train = 48 x 5 m/sec = 40 m/sec. 18 3 (200 + y) x 3 = 45 40 600 + 3y = 1800 y = 400 m.
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