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:

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Accepted Answer

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

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

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

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:

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