A can complete a work in 12 days with a working of 8 hours per day. B can complete the same work in 8 days when working 10 hours a day. If A and B work together, working 8 hours a day, the work can be completed in_______days.

A. 6 5?11

B. 5 5?11

C. 4 5?11

D. 6 4?11

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