GMAT 考满分题库

Magoosh - 数学PS - 275
Noelle walks from point A to point B at an average speed of 5 kilometers per hour. At what speed, in kilometers per hour, must Noelle walk from point B to point A so that her average speed for the entire trip is 6 kilometers per hour?
  • A6.75
  • B7
  • C7.25
  • D7.5
  • E7.75
正确答案: D

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