Two trains are moving in opposite directions at 60 km/hr and 90 km/hr. Their lengths are 1.10 km and 0.9 km respectively. The time taken by the slower train to cross the faster train in seconds is:

28 sec

36 sec

48 sec

52 sec

Relative speed = (60+ 90) km/hr = 150x5/18 = 120/3 m/sec Distance covered = (1.10 + 0.9) km = 2 km = 2000 m. Required time = 2000 x 3/125 = 48 sec.

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