The Auburn football team uses 3 different exercise regimens for increasing the cardio. An hour of regimen A rates a 3 in effectiveness, an hour of regimen B rates a 4 in effectiveness, and an hour of regimen C rates a 5 in effectiveness. In any given week, athlete can train at most three hours by regimen A. In any given week combined hours of regimens A and C may not exceed 8. In any given week combined hours of regimens B and C may not exceed 11. Compute how many hours of every regimen must they perform in the week to maximize increase in fitness?