X and Y work

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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DanaJ: Site Admin; Posts: 2567; Joined: Thu Jan 01, 2009 10:05 am; Thanked: 712 times; Followed by:550 members; GMAT Score:770

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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