Answer
$\dfrac{\sqrt[3]{75ac^2}}{5c}$
Work Step by Step
Rationalizing the denominator of the given expression, $
\dfrac{\sqrt[3]{3a}}{\sqrt[3]{5c}}
,$ we find:
\begin{array}{l}\require{cancel}
\dfrac{\sqrt[3]{3a}}{\sqrt[3]{5c}}\cdot\dfrac{\sqrt[3]{25c^2}}{\sqrt[3]{25c^2}}
\\\\=
\dfrac{\sqrt[3]{75ac^2}}{\sqrt[3]{125c^3}}
\\\\=
\dfrac{\sqrt[3]{75ac^2}}{\sqrt[3]{(5c)^3}}
\\\\=
\dfrac{\sqrt[3]{75ac^2}}{5c}
.\end{array}