And what we calculated here is just the average slope across this change in time. But we could see at any given moment, the slope is actually different. In the beginning, he has a slower rate of change of distance. Then over here, then he accelerates. Over here, it seems like his rate of change of distance, which would be roughly, or you could view it as the slope of the tangent line at that point, it looks higher than his average. And then he starts to slow down again. And when you all average it out, it gets to 23 and 1 1 half miles per hour.