GMAT 考满分题库

Magoosh - 数学PS - 31
Working alone, pump A can empty a pool in 3 hours. Working alone, pump B can empty the same pool in 2 hours. Working together, how many minutes will it take pump A and pump B to empty the pool?
  • A72
  • B75
  • C84
  • D96
  • E108
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正确答案: A

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