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

Shawna can do a certain job in 7 minutes. Kris can do the same job in 5 minutes. Shawna and Kris work together to complete the same job. However, Shawna starts working 3 minutes after Kris starts to work. How many minutes will it take for them to complete the job once Kris starts to work? minutes