Question

Sa transformam 72 km/h + 86 km/h...... m/s

Answer 1

72km/h=20m/s  
86km/h=23,9m/s
20+23,9=43,9m/s

Answer 2

$\displaystyle 72 \frac{km}{h} + 86 \frac{km}{h}...... \frac{m}{s} \\ \\\\ 72 \frac{10\not00}{36\not00} = \frac{720}{36} =20 \frac{m}{s} \\ \\ \\ 86 \frac{10\not00}{36\not00}= \frac{860}{36}=23,8 \frac{m}{s} \\ \\ \\ \\ 20+23,8=43,8 \frac{m}{s}$