Question
It takes Lucy 7 hours to sew a coat by herself. If Opal helps her, they will take 4 hours to sew the coat. How long will Opal take to sew the coat by herself? Express your answer in mixed number.
3 m

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It takes Lucy 7 hours to sew a coat by herself. If Opal helps her, they will take 4 hours to sew the coat. How long will Opal take to sew the coat by herself? Express your answer in mixed number.