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Question

400 metre long train ‘A’ is running with a speed of 61.2 km/hr. Train ‘B’ which is 442 metre long is running with a speed of 90 km/h in opposite direction of train ‘A’. For how much time, the smaller train is completely obscured by the larger train when they cross each other?

A 2 second

B 3 second

C 4 second

D 6 second

E 1 second

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