A can do a piece of work in 8 days which B alone can do in 10 days. In how many days both working together can do it?
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A's 1 day work= 1/8, B`s 1 day work = 1/10 ∴ (A+B) 1 day work = (1/8+1/10) = 9/40 Both cooperating can complete it in 40/9 days.
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