\[V_{1} = V_{2} + 15;\ \ \ \ \ S_{1} = 180\ км;\ \ \ \]
\[S_{2} = 225\ км.\]
\[1)\frac{180}{V_{2}} = \frac{225}{V_{2} + 15}\ \]
\[180 \cdot \left( V_{2} + 15 \right) = 225\ V_{2}\]
\[180V_{2} + 2700 = 225V_{2}\]
\[45V_{2} = 2700\ \ \ |\ :45\]
\[V_{2} = 60\ \left( \frac{км}{ч} \right) - скорость\ \]
\[одного\ автомобиля.\]
\[2)\ 60 + 15 = 75\ \left( \frac{км}{ч} \right) -\]
\[скорость\ второго\ \]
\[автомобиля.\ \]
\[Ответ:\ 60\ \frac{км}{ч};\ \ 75\frac{км}{ч}.\]