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What is the correct answer?

4

A train travelling at a speed of 75 mph enters a tunnel 31/2 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?

A. 2.5 min

B. 3 min

C. 3.2 min

D. 3.5 min

Correct Answer :

B. 3 min


Total distance covered  = 72 + 14 miles   = 154 miles.  Therefore Time taken  = 154 x 75hrs  = 120 hrs= 120 x 60 min.  = 3 min.
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