To find the length of each workout plan, we can use the total number of hours that Kaitlin spent training her clients on Friday and Saturday and the number of clients who did each plan on those days.
Let A be the length of plan A in hours and B be the length of plan B in hours. We can set up the following system of equations to represent the given information:
3A + 8B = 7
5A + 2B = 6
Solving this system of equations using elimination, we find that A = 0.6 hours and B = 0.4 hours.
Therefore, plan A lasts 0.6 hours and plan B lasts 0.4 hours.