1. A 280 metres long train, travelling at a uniform speed, crosses a platform in 60 seconds and a man standing on the platform in 20 seconds. What is the length of the platform ?
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By: anil on 05 May 2019 01.39 am
Let length of platform = $$l$$ metres Let speed of train = $$x$$ m/s Using, $$time = frac{distance}{speed}$$ => $$frac{280}{x} = 20$$ => $$x = frac{280}{20} = 14$$ m/s Time taken while crossing the platform, => $$frac{280 + l}{14} = 60$$ => $$280 + l = 60 imes 14 = 840$$ => $$l = 840 - 280 = 560$$ metres
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