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

Joe can do a certain job in 7 hours. Shawna can do the same job in 10 hours. Joe and Shawna work together to complete the same job. However, Joe starts working 1 hours after Shawna starts to work. How many hours will it take for them to complete the job once Shawna starts to work? hours