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[Problem Solving]
试题详情
题目：
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?
选项:
A、4
B、6
C、8
D、10
E、12
答案:
E
提问：
没能明白上一个老师讲的方程式时怎么来的，请老师解答一下。
解答：
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