To find volume $ V $ use formula:
$$ V = l \cdot w \cdot h $$After substituting $l = 5\, \text{cm}$, $w = 3\, \text{cm}$ and $h = 2\, \text{cm}$ we have:
$$ V = 5\, \text{cm} \cdot 3\, \text{cm} \cdot 2\, \text{cm} $$$$ V = 15\, \text{cm}^2 \cdot 2\, \text{cm} $$ $$ V = 30\, \text{cm}^3 $$