( \frac{16 + 75}{\frac{16}{4} + \frac{75}{25}} = \frac{91}{4 + 3} = \frac{91}{7} \approx 13 \, \text{км/ч} )
( \frac{16 + 75}{\frac{16}{4} + \frac{75}{25}} = \frac{91}{4 + 3} = \frac{91}{7} \approx 13 \, \text{км/ч} )