A train travelling at a speed of 75 mph enters a tunnel 312 miles long. The trai

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Question
A train travelling at a speed of 75 mph enters a tunnel 312 miles long. The train is 14 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?
Options
A. 2.5 min
B. 3 min
C. 3.2 min
D. 3.5 min

Correct Answer

3 min

Explanation

Total distance covered = $(\frac{7}{2} + \frac{1}{4})$ miles = $\frac{15}{4}$ miles

Time taken = $(\frac{15}{4 * 75})$ hrs = $\frac{1}{20}$ hrs = $(\frac{1}{20} * 60) m i n$ = 3 min

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