GMAT 考满分题库

- 数学PS -
Machine A needs 5 hours to complete a task. When machines A and B work together, the same task can be completed in 1.875 hours. How long does it take for B to finish the task alone?
  • A1h
  • B2h
  • C3h
  • D4h
  • E5h
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正确答案: C

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