GMAT Challenge Question

This week’s GMAT challenge from is a problem solving question.

An electric pump can fill a tank in 3 hours. Because of a leak in the tank it is taking 3.5 hours
to fill the tank. How many hours will it take for the leak can drain all the water of the tank when it is

  1. 19
  2. 20
  3. 21
  4. 22
  5. 23

Have a go at answering this and then review your answer.

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