GMAT 考满分题库

- 数学PS -
Machine A can produce 1000 pieces/hour, and machine B can produce 750 pieces/hour. If two machines work together to produce 12,000 items in eight hours, what is the shortest time does machine A have to work?
  • A5h
  • B6h
  • C6.86h
  • D7h
  • E8h
显示答案
正确答案: B

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