Question
Ken and Mark, together, can clean a house in 5 hours. If Ken is cleaning the house alone, he can only complete the task in 9 hours. How long will Mark take to clean a house all by himself? Express your answer in mixed number.
3 m

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Ken and Mark, together, can clean a house in 5 hours. If Ken is cleaning the house alone, he can only complete the task in 9 hours. How long will Mark take to clean a house all by himself? Express your answer in mixed number.