GMAT Problem Solving

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Source: Manhattan

Level: 3

Jack, Tom, Beth, and Ruth are each competing to paint one side of a square fence. The fastest, Jack, painted his side in 13 hours, the slowest, Tom, painted his side in 14 hours. Which of the following could NOT be the average of the times that each of the four competitors spent painting his or her side of the fence?

  • A 13.2
  • B 13.3
  • C 13.5
  • D 13.6
  • E 13.7

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