PLEASE HELP :'( Ian and Nadya can each wash a car and clean its interior in about 2 hours, but Chris needs 3 hours to do the work. If the three work together, how long will it take to clean 7 cars?

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PLEASE HELP :'( Ian and Nadya can each wash a car and clean its interior in about 2 hours, but Chris needs 3 hours to do the work. If the three work together, how long will it take to clean 7 cars?

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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Figured it out! If you calculate, it takes Nadya and Ian 1/2 a car an hour and chris cam wash 1/3 a car in an hour. 7 divided by 1 and 1/3 is 5 and 1/4, aka, 5 hours and 15 minutes. YES!
1/2 +1/2 + 1/3 =4/3 just reverse the answer that is for one car-> 3/4. multiply with 7 for 7 cars-> 21/4 so 21/4 hr-> 5hr 15 minutes

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