[tex]Dane:\\t_1 = 11^{oo}-10^{oo} = 1 \ h = 3 \ 600 \ s\\s_1 = 80 \ km = 80 \ 000 \ m\\t_2 = 11^{40}-11^{10} = 0,5 \ h = 1 \ 800 \ s\\s_2 = 50 \ km}\\Szukane:\\v_{sr}=?\\\\v_{sr} = \frac{s_{c}}{t_{c}}\\\\v_{sr} = \frac{80 \ km + 50 \ km}{1 \ h + 0,5 \ h} =\frac{130 \ km}{1,5 \ h} = 86,(6) \ \frac{km}{h} \approx86,67\frac{km}{h}\\\\v_{sr} =\frac{ 80000 \ m+50000 \ m}{3600 \ s + 1800 \ s} = \frac{130000 \ m}{5400 \ s} \approx24,07\frac{m}{s}\\\\\boxed{v_{sr} \approx 86,67\frac{km}{h}\approx24,07\frac{m}{s}}[/tex]
