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Source: OG11th
Level: 3
The water from one outlet, flowing at a constant rate, can fill a swimming pool in 9 hours. The water from a second outlet, flowing at a constant rate, can fill the same pool in 5 hours. If both outlets are used at the same time, approximately what is the number of hours required to fill the pool?
- A 0.22
- B 0.31
- C 2.5
- D 3.21
- E 4.56