<PRE><B>Question 975495</B>
a 550 yard long train travelling at 40 mph, enters a three mile long tunnel.
 How long will elapse between the moment the front of the train enters the tunnel and the moment the end of the train clears the tunnel?
:
Find the time it takes for the front of the train to go through the tunnel plus the length of the train.
:
Change 550 yds to miles: 550/1760 = .3125 mi
Total distance: 3.3125 mi
;
Time = dist/speed\
t = {{{3.3125/40}}}
t = .0828125 hrs
change this to minutes
.0828125 * 60 = 4.97 ~ 5 min to clear the tunnel</PRE>