A work is completed by P and Q working together 8 hours per day. Working 8 hours a day P alone will take 12 days to complete work, while working alone Q will take 10 days working 12 hours a day, to complete it. In how many days did they complete the work together?
1
7 days
2
62/3 days
3
61/2 days
4
\(5\frac{1}{4}\) days