How to measure the distance traveled by a Unity car?

Question

C++ / C#

Good!
Help solve the problem. I need a variable to store the distance that the car has traveled (the car on wheelColliders).

Answer 1

1. Speed ​​multiplied by time.
2. Vector3.Distance(point1, point2);

Answer 2

And in method 1, where can I find the speed of the car at the moment?