A train travelling at a speed of 75 mph enters a tunnel 7 2 miles long The train is 1 4 mile long Ho...........

Quantitative Aptitude (PCS) Problems on trains

A train travelling at a speed of 75 mph enters a tunnel 7/2 miles long. The train is 1/4 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?

1 min

3 min

5 min

6 min

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Explanation:

Actually train is covering length of tunnel + its own length here
so total distance = 7/2 + 1/4= 15/4 miles
time= distance /speed
time= (15/4) / 75 = 1/20 hour
(1/20)x60 = 3 min

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