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Answer : 2 32 sec Explanation : Answer: B) 32 sec Explanation: Given that,1st train speed = 62 km/hr 2nd train speed  = 44 km/hrHence the relative speed of two trains is : 62-44 = 18 km/hr = 18×518 m/s = 5 m/s.There fore, the first train crosses the second train i.e (85 75)mts of distance with a speed of 5m/s in,  time = distancespeed = 85 755 = 32 sec.

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