The Train and Tunnel Puzzle

A 300 ft. train is traveling at 300 ft. per minute and must travel through a 300 ft. long tunnel. How long will it take the train to travel through the tunnel?

2 minutes.

Explanation: The train needs 1 minute to cover the 300 ft. length of the tunnel, but since the entire train must clear the tunnel, it takes an additional 1 minute for the back of the train to exit.