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2013-01-27T16:11:10+01:00

a) 745m/h = 745/1000 km/h = 0,745 km/h

b) 3km/min = 3*60 km/h = 180 km/h

c) 12m/min = 12*60/1000 km/h = 0,72km/h

d) 7m/s = 7*3600/1000= 25,2 km/h    (3600 car tu multiplie 60 secondes par 60 minutes)