1. Two trains are moving in the same direction at the speed of 42 km/hr and 84 km/hr, their lengths are 320 metres and 380 metres respectively. What is the time taken (in seconds) by faster train to cross the slower train?
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By: anil on 05 May 2019 02.07 am
Let time taken = $$t$$ seconds The trains are moving in same direction, thus relative speed = $$84-42=42$$ km/hr = $$(42 imesfrac{5}{18})=frac{35}{3}$$ m/s Total distance = sum of lengths of train = $$320+380=700$$ m Using, time = distance/speed => $$t=700divfrac{35}{3}$$ => $$t=700 imesfrac{3}{35}=60$$ seconds => Ans - (A)
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