Contextual Applications of Differentiation · Medium problem

Water is poured into an inverted conical tank (height $10$ ft, top radius $5$ ft) at $3$ ft$^3$/min. How fast is the water level rising when the depth is $4$ ft? (Hint: $r=\tfrac{h}{2}$, so $V=\tfrac{\pi h^3}{12}$.) Round to 3 decimal places (an exact answer is also accepted).