Contextual Applications of Differentiation · Superchallenge problem

Water flows between two connected cylindrical tanks of radii $3$ m and $5$ m so that the total volume of water is always $200\pi$ m$^3$. The water level in the first tank is $h_1(t)=5+0.2t^2$ meters. Find the rate at which the level $h_2(t)$ in the second tank is changing, in m/min, at $t=3$ minutes.