Question
It takes Anna 9 hours to sew a windbreaker by herself. If Zoe helps her, they will take 5 hours to sew the windbreaker. How long will Zoe take to sew the windbreaker by herself? Express your answer in mixed number.
3 m

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It takes Anna 9 hours to sew a windbreaker by herself. If Zoe helps her, they will take 5 hours to sew the windbreaker. How long will Zoe take to sew the windbreaker by herself? Express your answer in mixed number.