zad.1
1m = 1/1000 km
1 s = 1/3600 h
V = 10 m/s
V = 10 * 1/1000 km/1/3600 s
V = 10/1000 km/1/3600 s = 10/1000 km*3600 1/s= 36 km/h
V = 10 m/s = 10m/1/60 min = 600 m/min
zad.2
t = 45 min = 45 *60 = 2700 s ; 1 min = 60 s
s = 54 km = 54000 m ; 1km = 1000 m
V = s/t
V = 54000 m/2700 s
V = 20 m/s