v = \frac{s}{t} = \frac{\frac{1}{2} k m}{\frac{1}{3} h} = 1, 5 \frac{k m}{h}

${v=\frac{s}{t} = \frac{\frac{1}{2}\,\mathrm{km}}{\frac{1}{3}\,\mathrm{h}} = 1,5\,\mathrm{\frac{km}{h}}}$

Error