Question 757518
A 500 yard long train, travelling at 90 mph, enters a three mile
 long tunnel. 
How many seconds will elapse between the movement the front of the
 train enters the tunnel and the moment the end of the train clears
 the tunnel?
:
Convert 500 yds to miles: {{{500/1760}}} = .284 mi
:
{{{((3 + .284))/90}}} * 3600 = 131.36 seconds