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It takes a person 15 minutes from home to the store and 25 minutes from the store to home. The distance from home to the store is 2km. What is the average speed of this person in two sections?
  • A2 km/h
  • B4 km/h
  • C6 km/h
  • D8 km/h
  • E10 km/h
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正确答案: C

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