Analyzing related rates problems: expressions

The radius $r(t)$r, left parenthesis, t, right parenthesis of a cone is increasing at a rate of $3$3 centimeters per second and the height $h(t)$h, left parenthesis, t, right parenthesis of the cone is decreasing at a rate of $4$4 centimeters per second. At a certain instant $t_0$t, start subscript, 0, end subscript, the radius is $8$8 centimeters and the height is $10$10 centimeters. What is the rate of change of the volume $V(t)$V, left parenthesis, t, right parenthesis of the cone at that instant?