Question
David and Japheth, together, can clean a storeroom in 5 hours. If David is cleaning the storeroom alone, he can only complete the task in 8 hours. How long will Japheth take to clean a storeroom all by himself? Express your answer in mixed number.
3 m

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David and Japheth, together, can clean a storeroom in 5 hours. If David is cleaning the storeroom alone, he can only complete the task in 8 hours. How long will Japheth take to clean a storeroom all by himself? Express your answer in mixed number.