Problems on Trains - Arithmetic Aptitude Questions and Answers

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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

Answer : Option A

Explanation :

Formula for converting from km/hr to m/s: X km/hr =		$[ X X \frac { 5 } {18 }]$			m/s.

Therefore, Speed =	[ 45 X $\frac {5 } { 18 }]$			m/sec	=		m/sec.

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

Formula for finding time=	$[\frac { Distance } { speed } ]$

Required time = $[\frac {500*2 } { 2 5} ]$			sec	= 40 sec.

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