Question

A train that is 1 mile long starts through a tunnel that is also 1mile long . The train is traveling 15 miles per hour. How long does it take for the train to get completely out of the tunnel?

Answer 1

4minutes in  order to get out

Answer 2

12 minutes because it is three miles into for the train to go completely in and out (one mile for the nose to enter, on mile for the nose to exit and tail enter, and one mile for tail to exit). 3/15=x/60