Dirk can clean a playground in 5 hours. Geralyn can clean a playground in only 4 hours. Which of the following can be used to determine the amount of time it would take for Dirk and Geralyn to clean a playground together? a. 1 over 5 plus 1 over x equals 1 over 4 b. 1 over x plus 1 over 4 equals 1 over 5 c. 1 over 5 plus 1 over 4 equals 1 over x d. 1 over 4 plus 1 over 5 equals x over 9

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Dirk can clean a playground in 5 hours. Geralyn can clean a playground in only 4 hours. Which of the following can be used to determine the amount of time it would take for Dirk and Geralyn to clean a playground together? a. 1 over 5 plus 1 over x equals 1 over 4 b. 1 over x plus 1 over 4 equals 1 over 5 c. 1 over 5 plus 1 over 4 equals 1 over x d. 1 over 4 plus 1 over 5 equals x over 9

Algebra
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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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Hint: x = time it takes Dirk to do the job alone y = time it takes Geralyn to do the job alone z = time it takes for them to do the job working together \[\Large \frac{1}{x}+\frac{1}{y}=\frac{1}{z}\]
@jim_thompson5910 thank you so so much!
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