[tex]\begin{gathered} \frac{125mL}{\text{ minute}} \\ 4.5L \\ t=\text{?} \\ \frac{125mL}{\text{ minute}}\cdot\frac{1L}{1,000mL}=0.125\frac{L}{\text{minute}} \\ \\ t=\frac{4.5L}{0.125(\frac{L}{\text{minute}})}=36\text{minutes} \\ \text{The kidneys will take 36 minutes to filter 4.5L of blood} \end{gathered}[/tex]