The base of a triangle is *decreasing* at a rate of $13$ millimeters per minute and the height of the triangle is increasing at a rate of $6$ millimeters per minute. At a certain instant, the base is $5$ millimeters and the height is $1$ millimeter. **What is the rate of change of the area of the triangle at that instant (in square millimeters per minute)?** [[☃ radio 1]]