So let's say that this is a toll booth, right? You're on the turnpike, and this is a toll booth at point A, and you get your toll, you get a, you reach it at exactly 1 p.m., and the highway's computers and stuff register that. Let's say you have some type of a, one of those devices so that when you pay the toll, it just knows who you are, and it takes your money from an account someplace. So it sees that you got there at exactly, you got there at exactly 1 p.m. And then, let's say that there's, and let's say you get off of the toll highway, the turnpike, let's say you get off of it at point B, and you get there at exactly 2 p.m. I'm making these numbers very easy to work with. And let's say that they are 80 miles apart. So this distance right over here is 80 miles.