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Answer with Explanation:

P can complete the work in (12 x 8) hrs. = 96 hrs.

Q can complete the work in (8 x 10) hrs. = 80 hrs.

 P's1 hour's work = 1/96 and Q's 1 hour's work = 1/80.

(P + Q)'s 1 hour's work = (1/96 + 1/80) = 11/480 .

So, both P and Q will finish the work in (480/11)hrs.

 Number of days of 8 hours each = (480/11 x 1/8) = 60/11 Days = 5 5/11 Days
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