First, let's write the equation that gives us the total amount spent (x) as a function of time t:
x = 35 + 6.8t (ommiting $ to simplify)
Now, since they want to spend less than $96.20, we must have
x < 96.2
So, we use the expression of x as a funtion of t to solve fot t:
35 + 6.8t < 96.2
6.8t < 96.2 - 35
6.8t < 61.2
t < 61.2/6.8
t < 9
Therefore, the possible amounts of time for which they could rent the meeting room is any value that satisfies:
t < 9 hours