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OpenStudy (anonymous):
Keith can wash and detail his car in 4 hours, and Marla can wash and detail her car in 5 hours. If they work together, how long will it take them to wash and detail both cars? Select one:
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OpenStudy (anonymous):
4 5 over 7hours b. 4 1 over 2hours c. 4 4 over 9hours d. 4 3 over 5hours
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