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Two trains A and B, 210 m and 150 m, respectively, in length, are running in the same direction on parallel lines. If the speed of A and B be 110 km/h
Question

Two trains A and B, 210 m and 150 m, respectively, in length, are running in the same direction on parallel lines. If the speed of A and B be 110 km/h and 128 km/h, respectively, then what will be the time (in seconds) taken by train B to cross train A?

A.

72

B.

74

C.

71

D.

70

Correct option is A

Total Distance = Relative Speed × Time 

360 = (128-110)×518× \frac{5}{18} ×Time

Time = 72 sec

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