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Machine A takes 24 hours to empty one cylinder of water. Machine A drains the water for 8 hours and then change to machine B. B's speed is 2 / 3 of that of A's. How long does it take B to drain the remaining water?
  • A10h
  • B12h
  • C16h
  • D20h
  • E24h
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正确答案: E

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