A train having a length of 1/4 mile , is traveling at a speed of 75 mph. it enters a tunnel 3 ½ miles long. how long does it take the train to pass through the tunnel from the moment the front enters to the moment the rear emerges?
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total length to cover = 3 1/2 ÷ 1/4 = 3 3/4 = 15/4 miles
speed = 75 mph
time = 15/4 ÷ 75 = 15 ÷ 300 h = 1/20 h = 3 minutes
speed = 75 mph
time = 15/4 ÷ 75 = 15 ÷ 300 h = 1/20 h = 3 minutes
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is speed in mile/ hr if it is then time taken is 2.8min
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