Question
Xuan and Erika take 3 hours to clean the house together. If Xuan takes 4 hours to clean the house on her own, how long will it take Erika to clean the house alone?
3 m

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Xuan and Erika take 3 hours to clean the house together. If Xuan takes 4 hours to clean the house on her own, how long will it take Erika to clean the house alone?