v₁=3,5km/h
t₁=czas
s₁=droga
t=s₁:v₁
v₂=2,5km/h
t₂=t₁
s₂=1,8km-s₁
t=s₂:v₂
t=s₁:3,5
t=(1,8-s₁):2,5
s₁/3,5=(1,8-s₁)/2,5
2,5s₁=3,5(1,8-s₁)
2,5s₁=6,3-3,5s₁
2,5s₁+3,5s₁=6,3
6s₁=6,3
s₁=6,3:6=1,05km
t₁=1,05km:3,5km/h=0,3h
spacer trwał 2*0,3h=0,6h, czyli 36 minut
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v₁=3,5km/h
t₁=czas
s₁=droga
t=s₁:v₁
v₂=2,5km/h
t₂=t₁
s₂=1,8km-s₁
t=s₂:v₂
t=s₁:3,5
t=(1,8-s₁):2,5
s₁/3,5=(1,8-s₁)/2,5
2,5s₁=3,5(1,8-s₁)
2,5s₁=6,3-3,5s₁
2,5s₁+3,5s₁=6,3
6s₁=6,3
s₁=6,3:6=1,05km
t₁=1,05km:3,5km/h=0,3h
spacer trwał 2*0,3h=0,6h, czyli 36 minut