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

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It takes Wendy 7 hours to sew a skirt by herself. If Betty helps her, they will take 3 hours to sew the skirt. How long will Betty take to sew the skirt by herself? Express your answer in mixed number.