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

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