How many seconds will elapse between the front of the train enter the tunnel and the end of the train clears the tunnel?

Question

A 275 yard long train, travelling at 50 mph, enters a 1.5 mile long tunnel.

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?

Answer 1

Train length=d1=275 yards=275/1760miles=0.156miles
Tunnel length=d2=1.5 mile
d=d1+d2=0.156+1.50=1.656miles
speed=50mph
t=d/s=1.656*3600/50=119.23seconds
Ans is 119.23 seconds