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OpenStudy (anonymous):
Jan and Nadya can each wash a car and clean its interior in about 2 hours, but Chris needs 3 hours to do thework. If the three work together, how long will it take to clean se ven cars.
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OpenStudy (anonymous):
Total time the three work together to clean a car: T = 6/ 11 hrs Thus 7 cars: ~3 hrs 50 min
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