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Working at a constant rate respectively, pumps \(X\) and \(Y\) took 48 hours to fill an empty water tank. What fraction of the water in a full tank came from pump \(X?\)
(1) Working alone at its constant rate, pump \(X\) would have taken 80 minutes to fill the tank with water.
(2) Working alone at its constant rate, pump y would have taken 120 minutes to fill up the tank.
[spoiler]OA=D[/spoiler]
Source: GMAT Prep
(1) Working alone at its constant rate, pump \(X\) would have taken 80 minutes to fill the tank with water.
(2) Working alone at its constant rate, pump y would have taken 120 minutes to fill up the tank.
[spoiler]OA=D[/spoiler]
Source: GMAT Prep
