Subject: mathqa
Question: 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 1 w widgets ?
Option: 
A: 10
B: 8
C: 6
D: 4
Answer: C