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GRE Math Work Rate: Practice Question of the Week #29

Here’s this week’s practice question– we’ll be posting the answer and explanation tomorrow, good luck!

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?

Update: Here’s the answer/explanation post!

By the way, students who use Magoosh GRE improve their scores by an average of 8 points on the new scale (150 points on the old scale.) Click here to learn more.

3 Responses to GRE Math Work Rate: Practice Question of the Week #29

  1. akshay December 13, 2011 at 7:25 am #

    yes its B …got it at last ….intriguing, how simple problems in life seem daunting …

  2. Sam December 13, 2011 at 7:07 am #


  3. elenad3d December 12, 2011 at 2:37 pm #


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