Simplifying Composite Functions

The radius $r$, in inches, of a spherical balloon is related to the volume, $V$, by $r(V)=\sqrt[3]{\dfrac{3V}{4\pi }}$. Air is pumped into the balloon, so the volume after $t$ seconds is given by $V(t)=10+20t$.

Find the time when the radius reaches $10$ inches.