Oblicz pisemnie, daje naj

Odpowiedź:
20km/0.5h= 40 km/h
2.54 km/h = 54*1000m/1*3600s = 54000m/3600s = 15 m/s
3. 1/3h * 54 km/h= 18 km
4. 60 km/ 30km/h = 2h