The Long Tunnel

          A train is one mile long. It travels at the rate of one mile a minute through a tunnel which is also one mile long.

           Can you say how long it will take for the train to pass completely through the tunnel? 

Answer:   For the train to pass completely through the tunnel. It has to travel 2 miles 1 mile , the train would be completely in the tunnel, and after another mile it would be completely out, and since the train is travelling at 1 mile a minute , it will take 2 minutes to pass through the tunnel.