1. Train A, whose length is 328 metre can cross a 354 metre long platform in 11 seconds. Train B can cross the same platform in 12 seconds. If the speed of train— B is 7/8th of the speed of train—A, what is the length of train—B ? (in m)
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By: anil on 05 May 2019 01.21 am
Speed = $$frac{ extrm{Length of train + Length of platform}}{Time}$$ => Speed of train A = $$frac{328 + 354}{11}$$ = $$frac{682}{11} = 62$$ m/s => Speed of train B = $$frac{7}{8} imes 62$$ = $$frac{217}{4}$$ m/s Let length of train B = $$l$$ => $$frac{l + 354}{12} = frac{217}{4}$$ => $$l + 354 = frac{217}{4} imes 12$$ => $$l + 354 = 217 imes 3 = 651$$ => $$l = 651 - 354 = 297$$ metre
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