To determine the time it will take for the train to travel through the tunnel, we need to consider the relative speed of the train and the length of the tunnel.
The train is traveling at a speed of 200 ft. per minute, and it needs to cover a distance of 200 ft. (the length of the tunnel). The relative speed between the train and the tunnel is the difference between the speed of the train and the length of the tunnel, since the train needs to "cover" the entire length of the tunnel.
Relative Speed = Train Speed - Tunnel Length Relative Speed = 200 ft./min - 200 ft.
Since the relative speed is zero (200 ft./min - 200 ft. = 0 ft./min), it means that the train will take no time to travel through the tunnel. In other words, the train will be able to pass through the entire 200 ft. tunnel instantaneously, assuming there are no delays or decelerations.