Answer:
C.
Step-by-step explanation:
You want to graph 2 functions for the cars rate of speed, the both axis will have either the distance or time of each car, when you graph the rate of change or the speed of which both cars are going, you will be able to see where the graphs intersect, when they intersect, it means that car 2 has caught up.
I hope this helps.
(Also I may have accidentally reposted, I didn't see my last answer show up so I apologize if I commented twice.)