GRE Problem Solving Question 721

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Source: Magoosh

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?

  • A 6.75
  • B 7
  • C 7.25
  • D 7.5
  • E 7.75

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