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s₁=v₁*t₁
s₂=(v₁+2km/h)*t₂
50= v₁*t₁ +(v₁+2)*t2
50=v₁*5+(v₁+2)*5
50=5v₁+5v₁+10
10v¹=50-10
10v¹=40 /:10
v¹=4
v₂=v₁+2km/h
v₂=4+2=6 km/h