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

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