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It took 15 minutes for a person to ride a bicycle from A to B. It took 25 minutes from B to A. The distance between A and B is 2km. What was the average speed of this person?
  • A6km/h
  • B10km/h
  • C12km/h
  • D16km/h
  • E20km/h
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正确答案: D

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