1. A train takes 52 seconds to cross a bridge of length 204 m. if the same train takes 18 seconds to cross a sign board, find the length of the train. (in metre)
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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 52 seconds to cross a bridge of length 204 m = $$s=frac{204+l}{52}$$ -----------(i) Also, $$s=frac{l}{18}$$ --------------(ii) Substituting value of $$s$$ from equation (ii) in (i), we get : => $$frac{l}{18}=frac{204+l}{52}$$ => $$52l=(204 imes18)+18l$$ => $$52l-18l=34l=204 imes18$$ => $$l=frac{204 imes18}{34}=108$$ $$ herefore$$ Length of train = 108 m => Ans - (D)
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