Philip and his good buddy Leroy 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. Philip has already finished 3 oil changes today, and can complete more at a rate of 1 oil change per hour. Leroy just came on shift, and can finish 2 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 Philip and Leroy each have done? How long will that take?