问题求解PS-PNPJ
出处: Manhattan

Machines A, B, and C can either load nails into a bin or unload nails from that bin. Each machine works at a constant rate that is the same for loading and for unloading, although the individual machines may have different rates. Working together to load at their respective constant rates, machines A and B can load the bin in 6 minutes. Likewise, working together to load at their respective constant rates, machines B and C can load the bin in 9 minutes. How long will it take machine A to load the bin if machine C is simultaneously unloading the bin?
  • A12 minutes

  • B15 minutes

  • C18 minutes

  • D36 minutes

  • E54 minutes

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正确答案:C
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