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t=10 min
s=9 km
s=v*t ==> v=s/t
v=90 km/min
90km/min= 90km/3600s=0,025 km/s
V=s/t=9km/10min=0,9km.min
t=10min=600s
s=9km
V=s/t
V=9km/600s=0,015km/s
9km/600s=0,9km/min