How many seconds will elapse between the moment the front of the train enters the tunnel and the moment the end.........

Question

A 110 yard long train, travelling at 80 mph, enters a tunnel of 1.5 miles in length.

How many seconds will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel? (to 2 decimal places).

Answer 1

110 Yard = 100.584 meter
80 MPH = 128.7475 KMPH = 128.7475 *1000/3600 m/s = 35.76 m/s
Tunnel Length = 1.5 miles = 2.41 Kilometers

Required TIme = (Length of the Tunnel + Length of the Train)/Speed of the Train = (2410 + 100.584)/35.76 = 70.20 seconds.