V=72km/h
t=30 s
d=?m


Răspuns :

V=d÷t
d=V×t
1h=3600s
d=72km/3600s×30s
d=72km÷1200
72km=72000m
d=72000m÷1200
d=720m÷12
d=60m
viteza = distanta / timp 


rezulta ca distanta = viteza x timpul 

viteza = 72 km / h = 72000m / 3600 s = 20 m/s 
timpul = 30 s 

distanta = 20 m/s x 30 s = 600 metri