Oblicz: 90km/h = ? m/s 25m/s = ? km/h 80km/h = ? m/s 20min/m = ? km/h

[latex]90 frac{km}{h} = frac{90 000m}{3600s} = 25 frac{m}{s} \ \ 25 frac{m}{s} = frac{0,025km}{frac{1}{3600}h} = 90 frac{km}{h} \ \ 80 frac{km}{h} = frac{80 000m}{3600s} = 22 frac{2}{9} frac{m}{s} \ \ 20 frac{m}{min} = frac{0,02km}{frac{1}{60}h} = 1,2 frac{km}{h}[/latex]