Final answer:
In kinematics, when two objects converge at a constant rate, the correct total distance equation is A) d = rt, where 'd' represents distance, 'r' stands for the rate of speed, and 't' denotes time.
Step-by-step explanation:
When two objects converge at a constant rate and meet, the total distance equation is A) d = rt, which stands for distance equals rate multiplied by time. This equation is fundamental in kinematics, the branch of physics that deals with the motion of objects without considering the forces that cause the motion. The provided information suggests that we are discussing constant speeds and uniform motion, which is why the simple linear relationship of distance, rate, and time applies.