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Answer the following work problem. Report your answer to the nearest tenth of a week.

Mary can do a certain job in 5 weeks. Juanita can do the same job in 11 weeks. Mary and Juanita work together to complete the same job. However, Mary starts working 2 weeks after Juanita starts to work. How many weeks will it take for them to complete the job once Juanita starts to work? weeks