GMAT Problem Solving
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Source: GWD
Level: 1
Pumping alone at their respective constant rates, one inlet pipe fills an empty tank to 
of capacity in 3 hours and a second inlet pipe fills the same empty tank to 
of capacity in 6 hours. How many hours will it take both pipes, pumping simultaneously at their respective constant rates, to fill the empty tank to capacity?
- A 3.25
- B 3.6
- C 4.2
- D 4.4
- E 5.5