medium · GMAT Quant
Pump A can fill a pool in 8 hours, and Pump B can fill the same pool in 12 hours. Both pumps run together for 3 hours, after which Pump A is turned off and Pump B finishes the job alone.
What is the total time elapsed from the start of the filling to its completion?
- 13.2 hours
- 4.8 hours
- 7.5 hours
- 6 hours
- 12 hours
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