Welcome to ETO, 3slink!
Have you built the car yet?
If not, I'd suggest (for simplicity) that you start with a car that has only one motor, with the idea that you'll simply reverse the voltage for the return trip. With a 1:200 gear ratio, the second motor, unless powered, will introduce far to much resistance to movement to make the car practical.
Then test it to get an idea of how well it works (speed, power, etc.). Then we can work on the circuit needed to do the task as you have described it. And I might add that controlling the return trip to stop at the starting point is doable, of course, but might it surprise you as to what is likely to be needed.
If you've already built the car, please share with us how you built it and in what configuration. Photos would be helpful.
Also, do you have any test equipment, for instance, a Volt/ammeter?