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

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