We know what our change in time is. Two minus one. And we know what our change in position is. We know that our change in position, our change in position, which is equal to S of two, S of two minus S of one, minus S of one, is equal to 80 miles. The change in position is 80 miles. So let me write that. And we'll just, for simplicity, assume it's a straight highway, so our change in distance is the same as our change in position, same as change in displacement.