#### Answer

$\color{blue}{2np\sqrt[4]{60m^3p}}$

#### Work Step by Step

Factor the radicand so that at least one factor is a perfect fourth power:
$=\sqrt[4]{16n^4p^4(60m^3p)}
\\=\sqrt[4]{2^4n^4p^4(60m^3p)}$
Bring out the fourth root of the perfect fourth root factors to obtain:
$=\color{blue}{2np\sqrt[4]{60m^3p}}$