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

Mary can do a certain job in 11 months. Juanita can do the same job in 5 months. Mary and Juanita work together to complete the same job. However, Mary starts working 4 months after Juanita starts to work. How many months will it take for them to complete the job once Juanita starts to work? months