[tex]Dane:\\s_1 = 16 \ km\\t_1 = 80 \ min\\s_2 = 2 \ km\\Szukane:\\t_2 = ?\\\\Rozwiazanie\\\\v = \frac{s}{t} = const.\\\\v=\frac{s_1}{t_1}\\oraz\\v = \frac{s_2}{t_2}\\\\\frac{s_1}{t_1} = \frac{s_2}{t_2}\\\\s_1\cdot t_2 = s_2\cdot t_1 \ \ /:s_2\\\\t_2 = \frac{s_2}{s_1}\cdot t_1\\\\t_2 = \frac{2 \ km}{16 \ km}\cdot80 s\\\\\boxed{t_2 = 10 \ min}[/tex]
