Given:
To rent a certain meeting room, a college charges a reservation fee of $39 and an additional fee of $8.40 per hour.
Let the number of hours = t and the total fee = F
So,
The chemistry club wants to spend less than $72.60 on renting the meeting room.
So, substitute with F = 72.6 and solve for t
so, the answer will be time should not exceed 4 hours