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A train travelling at a speed of 75 mph enters a tunnel 3 1/2miles 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?
2 min
2.5 min
3 min
4 min
Total distance covered =(7/2 + 1/4)miles =15/4miles
Time taken = (15 /4*75)hrs =1/20hrs
=(1/20*60)min = 3 min
Hence, option 3 is the correct answer.
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