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Write a system of equations to describe the situation below, solve using any method, and fill in the blanks.

Will and his good buddy Owen are both mechanics at a shop that does oil changes. They are in a friendly competition to see who can complete the most oil changes in one day. Will has already finished 4 oil changes today, and can complete more at a rate of 2 oil changes per hour. Owen just came on shift, and can finish 3 oil changes every hour. Sometime during the day, the friends will be tied, with the same number of oil changes completed. How many oil changes will Will and Owen each have done? How long will that take?