1. A train running at the speed of 84 km/hr passes a man walking in opposite direction at the speed of 6 km/hr in 4 seconds. What is the length of train (in metre) ?





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  • By: anil on 05 May 2019 01.55 am
    Speed of train = 84 km/hr = 84 x $$frac{5}{18}$$ = $$frac{70}{3}$$ m/sec speed of man = 6 km/hr = 6 x $$frac{5}{18}$$ = $$frac{5}{3}$$ m/sec As both are moving in opposite direction , relative speed = $$frac{5}{3}$$ + $$frac{70}{3}$$ = 25 m/sec Time to cross the man = 4 sec Let the length of train be L m ,then Using, Distance = Speed x Time L = 25 x 4 = 100 m
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