Spent 6 hrs at school, spent 2/3 of an hour at lunch, 2/3 of an hour at an assembly, rest of the time in class, how much time was spent in class

Answer 1

2/3 + 2/3 = 4/3 = 1 1/3

5 3/3 - 1 1/3 = 4 2/3 hours