# A 1/4 mile long train at speed of 76 mph enters a tunnel of 9/2 miles long. How long does it take for train to cross?

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A train travelling at a speed of 76 mph enters a tunnel 9/2 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?

posted May 10, 2017

For a train of length (1/4) mile long to cross a tunnel of (9/2) mile long it has to travel a distance of (9/2) + (1/4) = 4.75 miles ie., length of the tunnel + length of the train.
Therefore to find the time taken for this ===> distance / speed = Time
4.75/76 = 0.0625 hours = 225 seconds

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