Which is just going to be one hour. Over one hour. Or we could say that the slope of the line that connects these two points, let me do that in another color, the slope of, that's the same color, the slope of this line right over here, the slope right over here is 80 miles per hour. Slope is equal to 80 miles per hour. Or you could say that your average, your average velocity over that hour was 80 miles per hour. And so what the authorities could do in a court of law, and I've never heard a mathematical theorem cited like this, but they could, and I remember reading about this about 10 years ago, and it was very controversial, the authorities literally said, look, over this interval, your average velocity was clearly 80 miles per hour, so at some point in that hour, and they could have cited, they could have said by the mean value theorem, at some point in that hour, you must have been going at exactly 80 miles, at least frankly, 80 miles per hour. And it would have been very hard to disprove because your position as a function of time is definitely continuous and differentiable over that interval, it's continuous, you're not just getting teleported from one place to another, that'd be a pretty amazing car, and it is also differentiable, you always have a well-defined velocity.