Question
Ivan and Valen, together, can clean a room in 4 hours. If Ivan is cleaning the room alone, he can only complete the task in 10 hours. How long will Valen take to clean a room all by himself? Express your answer in mixed number.
3 m

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Ivan and Valen, together, can clean a room in 4 hours. If Ivan is cleaning the room alone, he can only complete the task in 10 hours. How long will Valen take to clean a room all by himself? Express your answer in mixed number.