A train travelling at a speed of 75 mph enters a tunnel 3½ miles long. The train is ¼ mile long. How long does it take for the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?

2.5 min
3 min
3.2 min
3.5 min

Correct Answer: 3 min

Explanation:

Total distance covered

=	❨	7	+	1	❩	miles
		2		4

=	15	miles.
	4

∴ Time taken

=	❨	15	❩	hrs
		4 x 75

=	1	hrs
	20

=	❨	1	x 60	❩	min.
		20

= 3 min.

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