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题库 / GMATLA-PS-15
Running at their respective constant rates, machine X takes 2 days longer to produce w widgets than machine Y. At these rates, if the two machines together produce 5/4 w widgets in 3 days, how many days would it take machine X alone to produce 2w widgets?
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12
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设1为总量，x为总量为1时的时间，则速度为1/x，得：
1/x+1/(x-2)=5/12-->(2x-2)/x/(x-2)=5/12,各选项/2带进去，12可以。
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