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b) 15m/min.=0,25m/s
c)150km/min=2500m/s
d)15km/h=4,1(6)m/s
e)150km/s=.150000m/s
f)15m/s=900m/min
g)150m/s=9km/min
h)15m/s=54km/h
Pozdrawiam! :)