Shifty Cylinder

The radius of a cylinder is growing at a rate of $2$ meter per hour, and the height of the cylinder is decreasing at a rate of $5$ meters per hour. At what rate is the volume of the cylinder changing (in cubic meters per hour) at the instant where the base radius is $3$ meters and the height is $6$ meters? The answer is in the form $k\pi$ for a constant $k$. Find $k$.