medium · GMAT Quantitative Reasoning
A swimming pool is equipped with an inlet pipe that can fill it in 4 hours and a drain pipe that can empty it in 12 hours, and both pipes are opened simultaneously while the pool is empty.
How long will it take to fill the pool to 75% of its capacity?
- 4.5 hours
- 3 hours
- 8 hours
- 5.5 hours
- 6 hours
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