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

Kris can do a certain job in 10 weeks. Tammy can do the same job in 9 weeks. Kris and Tammy work together to complete the same job. However, Kris starts working 4 weeks after Tammy starts to work. How many weeks will it take for them to complete the job once Tammy starts to work? weeks