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X and Y work

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X and Y work

by piyush_nitt » Fri May 08, 2009 5:12 am
X and Y work at constant rates, how many more hours does it take machine y, alone, to fill an order of a certain size than machine X alone.
a. X and Y together fill order in 2⁄3 the time that X alone does
b. Y alone does it in twice the time as X alone does

IMO : E
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Source: — Data Sufficiency |
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by DanaJ » Fri May 08, 2009 9:45 am
The answer to this question is pretty straightforward: you only have fractions in the two statements and no clues about number of hours. This is why you can't answer the question without further info.
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