Provide a step by step solution for the following math problem: On Mondays, Wednesdays, and Fridays, college student Kimo has three 1-hour  classes each day.  On Tuesdays and Thursdays, he has two 2-hour classes each day.  In one semester, there are 16 weeks of school.  In one semester, how many hours does Kimo spend attending classes?
Kimo spends 3 x 1 = 3 hours in class on any given Monday, Wednesday or Friday.
Each week, he spends 3 x 3 = 9 hours in class on Monday, Wednesday, and Friday.
In one semester, he spends 9 x 16 = 144 hours in class for Monday, Wednesday, and Friday.
He spends 2 x 2 = 4 hours in class on any given Tuesday or Thursday.
Each week, he spends 4 x 2 = 8 hours in class on Tuesday and Thursday.
In one semester, he spends 8 x 16 = 128 hours in class on Tuesday and Thursday.
In total for one semester, Kimo spends 144 + 128 = 272 hours attending classes.