Answer
$\dfrac{5\text{ L}}{\text{min}}=\dfrac{300\text{ L}}{\text{hour}}$
Work Step by Step
There are $60$ minutes in one hour.
Thus, multiply both the numerator and the denominator by $60$ to obtain:
$$\begin{align*}
\frac{5\text{ L}}{\text{min}}&=\frac{60\cdot 5\text{ L}}{60\cdot \text{ min}}\\
\\&=\frac{300\text{ L}}{60\text{ min}}\\
\\&=\frac{300\text{ L}}{\text{hour}}
\end{align*}$$
