A=600 with a maximum of 60 vehicles
Each car takes up 6 m
Each bus takes up 30 m
Max amount of cars in the lot would be 600 divided by 6 or 100 cars.
Max amount of buses in the lot would be 600 divides by 30 or 20 buses.
To collect the maximum amount of money using only 60 vehicles, park 20 buses and 40 cars.