Answer
$\color{blue}{\dfrac{\sqrt{15p}}{3p}}$
Work Step by Step
Rationalize the denominator by multiplying $3p$ to both the numerator and the denominator of the radicand to obtain:
$=\sqrt{\dfrac{5(3p)}{(3p)(3p)}}
\\=\sqrt{\dfrac{15p}{(3p)^2}}$
Bring out the square root of the denominator to obtain:
$=\dfrac{1}{3p} \cdot \sqrt{15p}
\\=\color{blue}{\dfrac{\sqrt{15p}}{3p}}$
