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The Mathematics Club of SBHS is holding their annual car wash to raise funds for club projects. Erika can wash and wax one car in

The Mathematics Club of SBHS is holding their annual car wash to raise funds for club projects. Erika can wash and wax one car in 5 hours. Romy can wash and wax one car in 4 hours. If Erika and Romy work together, how long will it take them to wash and wax one car?

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