Question
Risa and Shiyun take 2 hours to clean the villa together. If Risa takes 3 hours to clean the villa on her own, how long will it take Shiyun to clean the villa alone?
3 m

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Risa and Shiyun take 2 hours to clean the villa together. If Risa takes 3 hours to clean the villa on her own, how long will it take Shiyun to clean the villa alone?