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

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Hilda and Gem take 4 hours to clean the villa together. If Hilda takes 5 hours to clean the villa on her own, how long will it take Gem to clean the villa alone?