So, by this yellow information, they actually told us that this right over here is going to be equal to 3 4ths. So, this times 3 4ths times the rate of change of theta with respect to t. And so, now we just solve for this, and we're done. So, this is going to be, what's negative 20 times 3 4ths? That is negative 15, that is negative 15. If we divide both sides by negative 15, we get theta prime of t is equal to three over negative 15, three over negative 15, three over negative 15, which is the same thing as being equal to negative 1 5th, and the units here would be in radians per minute, because our rates are all in per minute. So, if I wanted to, I could write radians per minute. Ideally, I would write it right over here, but there you go.