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?

1.

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?

[A].	40 sec
[B].	42 sec
[C].	45 sec
[D].	48 sec

Answer: Option A

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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