[tex]5min = \frac{5}{60} h = \frac{1}{12} h \\ \\ 3min = \frac{3}{60} h = \frac{1}{20} h[/tex]
[tex]5 \frac{km}{h} - \frac{1}{12} h \\ \\ x - \frac{1}{20} h \\ \\ \\ x = \frac{5 \times \frac{1}{20} }{ \frac{1}{12} } = \frac{ \frac{5}{20} }{ \frac{1}{12} } = \frac{5}{20} \times 12 = \frac{60}{20} = 3 \frac{km}{h} [/tex]
Na codzień jeździ z prędkością 3km/h
Obliczmy jego drogę z domu do szkoły
[tex]v =3 \frac{km}{h} \\ t = 3min = \frac{3}{60} h = \frac{1}{20} h = 0.05h[/tex]
[tex]v = \frac{s}{t} | \times t \\ s = v \times t[/tex]
[tex]s = 3 \times 0.05 = 0.15km = \underline{150m}[/tex]
