[tex]\bf \begin{array}{ccll} pages&minutes\\ \cline{1-2} 8&5\\ 168&x \end{array}\implies \cfrac{8}{168}=\cfrac{5}{x} \\\\\\ \cfrac{1}{21}=\cfrac{5}{x}\implies x = 105\leftarrow \begin{array}{llll} \textit{1 hour and}\\ \textit{45 minutes} \end{array}[/tex]
