If you are going 70mph it would take you 1 hour
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It depends on the type/speed of the train, please be more precise with your question.
2 mintes
4 minutes. The last car on the train is the best way to think about it. That car has to travel the length of the train(1 mile) and also the length of the tunnel( also 1 mile). The total distance would be 2 miles, obviously. So if the train were traveling at 60mph it takes 1 minute to go 1 mile, but since it is going 30mph, it would take two minutes to go 1 mile.
From the time the front of the locomotive enters the tunnel . . .-- The front of the locomotive traverses the 1-mile tunnel, bringing the center of the train to the entrance.-- The center of the train traverses the 1-mile tunnel, bringing the end of the train to the entrance.-- The end of the train traverses the 1-mile tunnel.In all, the train has to travel 3 miles. At the rate of 12 mph, it takes (3/12) = 1/4 hour = 15 minutes.
If you are timing from when the train first enters the tunnel until the last car exits the tunnel, then the train would travel 2 miles during this time.So 2 mi / (15 mi/hr) = (2/15) hr * 60 (min/hr) = 8 minutes