Question
Julian and Mark, together, can clean a bedroom in 4 hours. If Julian is cleaning the bedroom alone, he can only complete the task in 9 hours. How long will Mark take to clean a bedroom all by himself? Express your answer in mixed number.
3 m

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Julian and Mark, together, can clean a bedroom in 4 hours. If Julian is cleaning the bedroom alone, he can only complete the task in 9 hours. How long will Mark take to clean a bedroom all by himself? Express your answer in mixed number.