Question
Harry and Zeph, together, can clean a bedroom in 4 hours. If Harry is cleaning the bedroom alone, he can only complete the task in 7 hours. How long will Zeph take to clean a bedroom all by himself? Express your answer in mixed number.
3 m

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Harry and Zeph, together, can clean a bedroom in 4 hours. If Harry is cleaning the bedroom alone, he can only complete the task in 7 hours. How long will Zeph take to clean a bedroom all by himself? Express your answer in mixed number.