Zamień: 5m/s= ....   km/h 40cm/s=... km/h 15km/h =.... cm/min 35m/h = .... cm/s  Poprosze odpowiedzi z obliczeniami :) 

5m/s=(5*0,001km)/(1/3600)h=18km/h 40cm/s=(0,4 *0,001km)/(1/3600)h=1,44km/h 15km/h=(15*1000*100cm)/(60min)= 25 000cm/min 35m/h=(35*100cm)/(3600s)= 0,97(2) cm/s