1 . An empty swimming pool can be filled to capacity through an inlet pipe in 3 hours, and it can be completely drained by a drainpipe in 6 hours . If both pipes are fully open at the same time , in how many hours will the empty pool be filled to capacity?
- A. 4
- B. 6
- C. 5
- D. 5.5
- D. None of these
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