4. A pump can empty a small pond in 4 hours. Another more efficient pump can do the job in 3 hours. How long would it take to empty the pond if both pumps were used

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4. A pump can empty a small pond in 4 hours. Another more efficient pump can do the job in 3 hours. How long would it take to empty the pond if both pumps were used

Mathematics
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At vero eos et accusamus et iusto odio dignissimos ducimus qui blanditiis praesentium voluptatum deleniti atque corrupti quos dolores et quas molestias excepturi sint occaecati cupiditate non provident, similique sunt in culpa qui officia deserunt mollitia animi, id est laborum et dolorum fuga. Et harum quidem rerum facilis est et expedita distinctio. Nam libero tempore, cum soluta nobis est eligendi optio cumque nihil impedit quo minus id quod maxime placeat facere possimus, omnis voluptas assumenda est, omnis dolor repellendus. Itaque earum rerum hic tenetur a sapiente delectus, ut aut reiciendis voluptatibus maiores alias consequatur aut perferendis doloribus asperiores repellat.

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one pump does 1/4th of the work in one hour other does 1/3 rd of work in one hour together they will do 1/4+1/3=7/12 work in one hour so they'll complete the work in 12/7 hours or 1.714 hours

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