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Machines X and Y work at their respective constant rates. How many more hours does it take machine Y, working alone, to fill a production order of a certain size than it takes machine X, working alone?
(1) Machines X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does
(2) Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does
[spoiler]OA=E[/spoiler]
Source: GMAT Prep
(1) Machines X and Y, working together, fill a production order of this size in two-thirds the time that machine X, working alone, does
(2) Machine Y, working alone, fills a production order of this size in twice the time that machine X, working alone, does
[spoiler]OA=E[/spoiler]
Source: GMAT Prep
