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# Machines X and Y work at their respective constant rates.

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Machines X and Y work at their respective constant rates. [#permalink]

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28 May 2006, 07:21
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Machines X and Y work at their respective constant rates. How many 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.

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Director
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28 May 2006, 09:17
The order size, the rates - everything appears to be unknown...

Answer should be E.

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28 May 2006, 09:33
Agree both 1 and 2 provide the same info. Rate of Y = 2*rate of X, but order size is not ptovided.

Hence E.
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28 May 2006, 12:10
http://www.gmatclub.com/phpbb/viewtopic ... ates+hours
good explanation here
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28 May 2006, 12:10
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# Machines X and Y work at their respective constant rates.

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