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There are three machines in the factory. The machines A, B and, C need 90min, 30min and 15min respectively to produce 80000 sheets of paper. If 3 machines work together, how many minutes does it take to produce 80000 sheets of paper?
  • A5
  • B7
  • C9
  • D11
  • E13
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正确答案: C

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