题目信息
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 $$\frac{4}{5}$$w widgets in 3 days, how many days would it take Machine X alone to produce 2w widgets?
A:4
B:6
C:8
D:10
E:12
参考答案及共享解析

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已选答案:
正确答案:
E:12
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