Question
It takes Anna 9 hours to sew a skirt by herself. If Xuan helps her, they will take 2 hours to sew the skirt. How long will Xuan take to sew the skirt by herself? Express your answer in mixed number.
3 m

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It takes Anna 9 hours to sew a skirt by herself. If Xuan helps her, they will take 2 hours to sew the skirt. How long will Xuan take to sew the skirt by herself? Express your answer in mixed number.