Need assistance on how to solve the following problem

1. Two areas are under consideration for disposal sites: The first site (A) has a capacity of 20 million cubic meters. The regional EPA Board has mandated that the lower five million cubic meters can be filled with inert material only (concrete, brick, earth, etc.). The owners must buy the inert material and haul it to the area for the bottom fill before other refuse can be dumped there. The second site (B) has a capacity of 15 million cubic meters and no requirement for bottom fill; however the location would result in an average increase from the first site (A) in the travel distance (round-trip) of 8 miles for 50% of the region, an average decrease in the travel distance (round-trip) of 4 miles for 25% of the region, and no change for the remainder of the users.
2. Assume the following:
3. - Cost of inert material (material & transport) for the first site will be $4.30 per cubic meter
4. - Average speed of trucks to and from the disposal site is 30 mph
5. - The truck and crew will cost $350 per hour
6. - Truck capacity is five tons per load or 25 cubic meters
7. Which site would you recommend and why? Show your work.