I'm not even sure if this is the right board to post this issue, but I worked this out with variables and eventually confused myself to insanity. Help is very much appreciated!
The athlete was afraid because the coach's anger increased exponentially. Only 20 minutes after practice began, the coach was twice as angry as when the practice began. How many time more angry will the coach be at the end of the three hour practice?
(use the At = Aoe^(kt) exponential formula)