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

Sue can do a certain job in 6 days. Shawna can do the same job in 9 days. Sue and Shawna work together to complete the same job. However, Sue starts working 1 days after Shawna starts to work. How many days will it take for them to complete the job once Shawna starts to work? days