So we could write as meters, let me write it out, meters per minute per minute, which is the same thing as meters per minute, meters per minute squared. Alright, let's do the next part. Based on the model, based on the model b from part c, find Bob's average velocity during the interval from zero is less than or equal to t, is less than or equal to 10. And if the notion of average velocity or average value of a function is completely foreign to you, I encourage you to watch the videos on Khan Academy on finding the average of a function. But straight, just to kind of cut to the chase, the average velocity, the average velocity is going to be the area under the velocity curve divided by our change in time. So the area under the velocity curve from t equals zero to t equals 10 of b of t, of b of t, dt, divided by our change in time. So it's going to be divided by, well, you're going from zero to 10, so 10 minus zero is going to be equal to 10.