Jedno działanie !! 2 i 1/8 m/s zamień na km/h

1km=1000m 1h=3600s   2 i 1/8 m/s=2,125 m/s 2,125 * (1/1000)km/(1/3600)h=2,125 * 1/1000km * 3600/1h=2,125 * 3600/1000 km/h= 2,125 *3,6 km/h=7,65 km/h