Two trains 140 m and 160 m long run at the speed of 60 km/hr and 40 km/hr respectively in opposite directions on parallel tracks. The time (in seconds) which they take to cross each other, is:

9
9.6
10
10.8

Correct Answer: 10.8

Explanation:

Relative speed = (60 + 40) km/hr =	❨	100 x	5	❩m/sec	=	❨	250	❩m/sec.
			18				9

Distance covered in crossing each other = (140 + 160) m = 300 m.

Required time =	❨	300 x	9	❩sec	=	54	sec = 10.8 sec.
			250			5

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