In SI, lungimea se masoara in metri, timpul in secunde, viteza in m/s
1 ora = 3600 s
1 min = 60 s
1 km = 1000 m
1 dm = 0,1 m
30 min = 30 x 60 = 1800 secunde
80 km/h = 80 000 m / 3600 s = 22,22 m/s
2h20 min = 2 x 3600 + 20 x 60 = 8 400 s
20 km = 20 x 1000 = 20 000 m
12 km = 12 x 1000 = 12 000 m
220 dm /min = 22 m /60 s = 0,366 m/s
