GMAT 考满分题库

- 数学PS -
It will take 20 minutes for A, B, C together to complete a task. A will need 240 minutes if he works alone. B will need 40 minutes if he works alone. How long will it take for C to complete this task alone?
  • A36
  • B40
  • C44
  • D48
  • E52
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正确答案: D

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