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v₁=1m/s
v₂=3m/s
d=2000m=s
t=?
t=s/v
v=v₂-v₁
v=3m/s-1m/s
v=2m/s
t=2000m/2m/s=1000s
Odp. Rejs pomiędzy przystaniami będzie trwał 1000s