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It took 2.4 hours for A and B to perform A task together. If A and B perform the same task alone, the time that B spent was 1.5 times as much as that of A. How many hours did it take B to perform this task alone?
  • A2h
  • B4h
  • C6h
  • D8h
  • E10h
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正确答案: C

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