You can 
put this solution on YOUR website! 
                                                    
                 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   and 2 sixtieths of an hour is 2 minutes.
Edwin
 and 2 sixtieths of an hour is 2 minutes.
Edwin