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s=21km
t=1min10s =60s+10s=70s
V=s/t
V=21km :70s =0,3km/s
0,3km/s =0,3*3600km/h =1080km/h
2.
s=243km
t=4h30min =4 1/2h =9/2h
V=243km :9/2 h =243*2/9 km/h =27*2km/h =54km/h