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1. 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. 55 miles/hours
  • B. 55 miles/hours
  • C. 55 miles/hours
  • D. 55 miles/hours

Answer: Option C

Explanation:

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