A 300 foot train is travelling at 300 foot per minute and must travel through a 300 foot long tunnel.
How long will it take the train to travel through the tunnel?
Answer
The train will take 2 minutes to travel through the tunnel.
The front of the train will take 1 minute to travel through the tunnel. The back of the train would have just entered the tunnel after 1 minute and it would take another 1 minute for the back of the train to travel through the tunnel.