Cut Along the Tracks Riddle

Question

Walking home one day you take a short cut along the train tracks. The tracks cross a narrow bridge over a deep gorge. At the point you are 3/8 of the way across the bridge you hear the train whistle somewhere behind you. You charge across the bridge and jump off the track as the train is about to run you down. As it happens if you had gone the other way you would have reached safety just before being run over as well.If you can run ten miles per hour how fast is the train moving?

Answer

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