Question 254154
<pre><font size = 4 color = "indigo"><b>
                                                    
                 A                                   B
 ---------------- ---------------- ------------------
| Train going in |     Tunnel     | Train coming out | 
 ---------------- ---------------- ------------------
      1 mile          1 mile            1 mile  

For the engine to move from point A to point B which is 2 miles,
we use  {{{T=D/R = 2/60}}} and 2 sixtieths of an hour is 2 minutes.

Edwin</pre>