Question
Xandra and Penelope take 4 hours to clean the house together. If Xandra takes 5 hours to clean the house on her own, how long will it take Penelope to clean the house alone?
3 m

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Xandra and Penelope take 4 hours to clean the house together. If Xandra takes 5 hours to clean the house on her own, how long will it take Penelope to clean the house alone?