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A train 108 m long moving at a speed of 50 km/hr crosses a train 112 m long coming from opposite direction in 6 seconds. The speed of the second train is:

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A. 48 km/hr

B. 54 km/hr

C. 66 km/hr

D. 82 km/hr

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Correct Answer : D.


Let the speed of the second train be x km/hr.  Relative speed = (x + 50) km/hr = (x + 50) x 518 m/sec  = 250 + 5x18 m/sec.  Distance covered = (108 + 112) = 220 m.  Therefore 220250 + 5x18  = 6⇒ 250 + 5x = 660  ⇒ x = 82 km/hr.

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