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

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