Two trains having lengths 200m and 255m cross each other in 7 seconds when travelling in the opposit...........

Quantitative Aptitude(IBPS RRB PO) Problems on trains

Two trains having lengths 200m and 255m cross each other in 7 seconds when travelling in the opposite direction and in 91 seconds when travelling in the same direction. Find the speed of the slower train (in km/hr).

108

126

102

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Explanation:

In the opposite direction,
Sum of speeds (Faster+Slower) =(200+255)/7 = 65 m/s --(i)
Difference of speeds(Faster-Slower) = (200+255)91 = 5 m/s--(ii)
From (i)&(ii),
speed of the slower train = 30 m/s = 108 km/hr