Two trains 220 metres and 170 metres long are running in the opposite direction with speeds of 72 km/hr and 36 km/hr on parallel tracks. In how much time will they cross each other ?

8 sec

10 sec

12 sec

13 sec

Relative speed = (72 + 36) km/hr = 108 km/hr. = 108 * 5/18 = 30 m/sec. distance covered in crossing each other = (220 + 170) m = 390 m. Required time = (390/30) = 13 sec.

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