A train 360 m long is running at a speed of 45 km/hr. In what time will it pass a bridge 140 m long?

40 sec
42 sec
45 sec
48 sec

Correct Answer: 40 sec

Explanation:

Formula for converting from km/hr to m/s: X km/hr =	❨	X x	5	❩	m/s.
			18

Therefore, Speed =	❨	45 x	5	❩m/sec	=	25	m/sec.
			18			2

Total distance to be covered = (360 + 140) m = 500 m.

Formula for finding Time =	❨	Distance	❩
		Speed

∴ Required time =	❨	500 x 2	❩sec	= 40 sec.
		25

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