Mr. and mrs. miller both get in their cars and begin to drive at the same time. mr. miller is 280 mi from their house and drives directly home at a constant rate of 40 mph. mrs. miller is at their house and drives away from the house at a constant rate of 30 mph. let d represent distance from home, and let t represent time in hours. which system models this situation? a. d = 280 + 40t d = 30t. b. d = 280 − 30t d = 40t. c. d = 280 − 40t d = 30t. d. d = 280 − 40t d = 280 + 30t