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

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