You are a time traveler and whenever you go back in time, you always make sure that you have a car fit from that time. You construct the car out of the materials that are available that time. You know that you need to arm these cars as there are lots of dangerous wild creatures from each time.
Drive your car as fast as you can till you reach the finish line. You will earn money base on the distance that you traveled. You can use the money to buy some upgrades for your car. Of course, you can't use the same car in the next scene as that would be obsolete and to slow for that time.