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10km/h - x h
2*40=10*x
80=10x
10x=80 /:10
x=8 h
Odp. Potrzebowałby 8 godzin
s=Vt=40*2=80km
v=40-10=30km/h
t=s/v=80km:30km/h=2h 40 min