A train travelling speed is 75 mph enters in a tunnel 3.5 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 of the front enters to the moment the rear emerges?

A) 2 min

B) 3.5 min

C) 4 min

D) 3 min

Total covered distance = (3.5 + (1/4))

= 15/4 miles

Time = (15/(4 * 75)) hrs

= 1/20 hrs = (1/20 * 60) min

= 3 min

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