And then we just have to divide both sides by 12. And so now we get a little bit of a drum roll. The derivative, the rate of change of h with respect to time is equal to negative 64 divided by 12 is equal to negative 64 over 12, which is the same thing as negative 16 over 3. Yep, that's right, which is equal to negative 5 and 1 third feet per second. So we're done. But let's just do a reality check. Does that make sense that we got a negative value right over here?