medium · GMAT Quantitative Reasoning
Pumps A and B working together fill a tank in 6 hours. They work together for 2 hours, then pump A is turned off, and pump B alone finishes filling the tank in 9 more hours.
How many hours would pump B alone need to fill the entire tank?
- 9
- 12
- 27/2
- 15
- Cannot be determined from the information given
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