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

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Cathy and Sabrina take 3 hours to clean the flat together. If Cathy takes 4 hours to clean the flat on her own, how long will it take Sabrina to clean the flat alone?