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Running at their respective constant rates, Machine X takes

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Running at their respective constant rates, Machine X takes 2 days longer to produce w widgets than Machine Y. At these rates, if two machines together produce 5/4w 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

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