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b)0,3dm=0,00003km
c)144km/h=40m/s
d)20m/s=72m/h
b)0,3dm=0,3dm*0,0001km=0,00003km
c)144km/h=144km/h *1000m /3600s=40m/s
d)20m/s=20m/s *3600s /1000m=72km/h