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Q.
A train travelling at a speed of 75 mph enters a tunnel 3 1/2miles long. The train is 1/4mile 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
View Answer
Correct choice: B
Explanation:
Total distance covered =(7/2+1/4)miles =15/4miles Time taken = (15/4*75)hrs =1/20 hrs =(1/20*60)min = 3 min
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