Question
It takes Emma 7 hours to sew a vest by herself. If Kathy helps her, they will take 2 hours to sew the vest. How long will Kathy take to sew the vest by herself? Express your answer in mixed number.
3 m

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It takes Emma 7 hours to sew a vest by herself. If Kathy helps her, they will take 2 hours to sew the vest. How long will Kathy take to sew the vest by herself? Express your answer in mixed number.