GMAT 考满分题库

- 数学PS -
It takes 12 hours for machine A to make 1200 parts alone. Machine B works at 1/10 of the speed of machine A. How long will it take if B makes 400 parts alone?
  • A32h
  • B36h
  • C40h
  • D44h
  • E48h
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正确答案: C

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