The flow rate into a rectangular clarifier is 3 million gallons per day in a cank 80 feet long and 25 feet wide. What is the surface loading rate in gallons per square foot of surface area per day?
1. 1,000 gal/ft².d
2. 1,500 gal/ft².d
3. 1,110 gal/ft².d
4. 1,400 gal/ft².d