Two minutes per mile at 30 mph.
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30 minutes
1 mile in 3 minutes is3 min * 20 is 1 hour1 mile * 20 = 20 mph
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.
1 mile in 6 minutes = 10 miles in 60 minutes (or an hour) So the answer is 10 mph.
25/3.5 = ?/1 ? = 25*1/3.5 ? = 7.143 minutes per mile