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

Alice can do a certain job in 7 weeks. Shawna can do the same job in 10 weeks. Alice and Shawna work together to complete the same job. However, Alice starts working 3 weeks after Shawna starts to work. How many weeks will it take for them to complete the job once Shawna starts to work? weeks