Viteza medie este data de raportul distanta supra timp
vm=d/t
d=62-26=36km
t=15:15-14:45=30min=0,5h
vm=d/t=36/0,5=72km/h
Daca vrem s-o transformam in m/s, tinem seama ca 1km=1000m si 1h=3600s
vm=72km/h=72km/1h=72×1000m/1×3600s=72×1000/3600 m/s
Adica vm=72×1/3,6 m/s=72/3,6=20m/s
Deci vm=72km/h=20m/s.
