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A train travels 10 miles at a speed of 50 miles per hour. How fast must the train teavel on the reture trip if the round-trip travel time is 20 minutes?

A train travels 10 miles at a speed of 50 miles per hour. How fast must the train teavel on the reture trip if the round-trip travel time is 20 minutes? Correct Answer 75 miles/hours

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