A train 800 metres long is running at a speed of 78 km/hr. If it crosses a tunnel in 1 minute, then the length of the tunnel (in meters) is:

130
360
500
540

Correct Answer: 500

Explanation:

Speed =	❨	78 x	5	❩	m/sec	=	❨	65	❩	m/sec.
			18					3

Time = 1 minute = 60 seconds.

Let the length of the tunnel be x metres.

Then,	❨	800 + x	❩	=	65
		60			3

⟹ 3(800 + x) = 3900

⟹ x = 500.

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