Q. P can complete a work in 12 days working 8 hours a day,Q can complete the same work in 8 days working 10 hours a day. If both P and Q work together, working 8 hours a day, in how many days can they complete the work?

1. 5x5/11
2. 5x6/11
3. 6x5/11
4. 6x6/11