zamienić 36km/h=m/s ,188km/h=m/s,20m/s=km/h,90cm/h=m/min

36 km/h = 36* 1000 m/ 3600 s = 10 m/s 188 km/h = 188 *1000 m/ 3600 s = 52,2 m/s 20 m/s = 20* 1/1000 km  /  1/3600 h = 20*3600/1000 = 72 km/h 90 cm/h = 0,9 m/60 min = 0,015 m/min