Two trains 100 meters and 120 meters longer running in the same diredtion with speeds of 72 km/hr and 54 km/hr. In how much time will the first train cross the seconds?

40 sec

42 sec

44 sec

48 sec

Relative Speed of trains = (72 - 54) km/hr = 18 km/hr = (18 x 5 /18) km/hr = 5 m /sec. Time taken to cover = (100 + 120) m/sec = (220 / 5 ) sec = 44 sec

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