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

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