1. A train takes 53 seconds to cross a bridge of length 288 m. if the same train takes 17 seconds to cross a sign board, find the length of the train
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By: anil on 05 May 2019 01.13 am
Let length of train = $$l$$ m and speed = $$s$$ m/s Speed of train which takes 53 seconds to cross a bridge of length 288 m = $$s=frac{288+l}{53}$$ -----------(i) Also, $$s=frac{l}{17}$$ --------------(ii) Substituting value of $$s$$ from equation (ii) in (i), we get : => $$frac{l}{17}=frac{288+l}{53}$$ => $$53l=(288 imes17)+17l$$ => $$53l-17l=36l=288 imes17$$ => $$l=frac{288 imes17}{36}=136$$ $$ herefore$$ Length of train = 136 m => Ans - (D)
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