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

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