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A and B work together for 2 hours to complete $$\frac{2}{3}$$ of the task. The rest of the work was done by B alone, and B finished the rest in 3 hours. If A does it alone, how many hours will it take to complete the whole task?
  • A6
  • B4.5
  • C12
  • D10
  • E9
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正确答案: B

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