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200 metre long train lsquo;Arsquo; is running with a speed of 72 km/hr. Train lsquo;Brsquo; which is 290 metre long is running with a speed of 90 km/h in opposite direction of train lsquo;Arsquo;. For how much time, the smaller train is completely obscured by the larger train when they cross each other?

A 2 second

B 1 second

C 6 second

D 3 second

E 4 second

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