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It took a person 15 minutes to reach B from A and 25 minutes to ride from B to A. The distance between A and B is 2 km. What's the average speed of the person?
  • A 2 km/h
  • B 3 km/h
  • C 4 km/h
  • D 5 km/h
  • E 6 km/h
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正确答案: E

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