V = s /t t₁ = 2.5h t₂ = 3.5h s₁ = s₂ V₁ - V₂ = 4 km/h s/2.5 - s/3.5 = 4 s/5 - s/7 = 8 7s/35 - 5s/35 = 8 2s/35 = 8 2s = 280 s = 140 km. V₁ = 140 / 2.5 V₁ = 56 km/h
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V = s /t
t₁ = 2.5h
t₂ = 3.5h
s₁ = s₂
V₁ - V₂ = 4 km/h
s/2.5 - s/3.5 = 4
s/5 - s/7 = 8
7s/35 - 5s/35 = 8
2s/35 = 8
2s = 280
s = 140 km.
V₁ = 140 / 2.5
V₁ = 56 km/h