GRE Problem Solving Question 729

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Source: Magoosh

Pump A can empty a pool in A minutes, and pump B can empty the same pool in B minutes. Pump A begins emptying the pool for 1 minute before pump B joins. Beginning from the time pump A starts, how many minutes will it take to empty the pool?

  • A
  • B
  • C
  • D
  • E

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