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# Machine X and Y work at their respective constant rates. How

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Machine X and Y work at their respective constant rates. How [#permalink]  04 May 2006, 17:39
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Machine 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 take machine X, working alone?

1)Machine X and Y, working together, fill the production order of this size in two-thirds the time that machine X, working alone does.

2) Machine Y, working alone, fill a production order of this size twice the time the machine X, working alone, does.
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