2. A 30,000 gallon tank is being filled with water. Before you start there are already 12,000 gallons of water in the tank. The hose fills the tank at a rate of 4000 gallons per hour. Part A: Write an equation that can be used to determine the number of hours it takes to fill the tank. Let h represent the number of hours the hose is running. Let g represent the total gallons that are in the tank. Part B: Suppose you start filling the tank at noon. By what time will the tank be completely filled? A. 4:00 pm B. 5:00 pm C. 7:00 pm D. 8:00 pm​