Mary decided to swim 10km up the Bega river without leaving the river. She swam 2km every hour then floated on her back for 10 minutes. Each time she floated, the current dragged her back 1km. How long did it take Mary to complete the swim?
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the Bega river without leaving the river. She swam 2km every hour then floated on her back for 10 minutes. Each time she floated, the current dragged her back 1km.
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