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Mathematics 7 Online
OpenStudy (anonymous):

Delia and Kari have the same size bathroom. It takes Delia 3 hours longer to finish tiling her bathroom than Kari. If they work togther it takes them 2 hours to lay the tiles per bathroom. How long does it take Kari to lay the tiles in her bathroom by herself? How long does it take Delia to finish her bathroom if she works alone?

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