The side of the base of a square pyramid is increasing at a rate of $6$ meters per minute and the height of the pyramid is *decreasing* at a rate of $1$ meter per minute.
At a certain instant, the base's side is $3$ meters and the height is $9$ meters.
**What is the rate of change of the volume of the pyramid at that instant (in cubic meters per minute)?**
[[☃ radio 1]]
*The volume of a square pyramid with base side $s$ and height $h$ is $\dfrac{1}{3}s^2h$.*