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t₁ = 0,5/V₁ = 0,5/80 = 1/160
t₂ = 0,5/V₂ = 0,5/50 = 1/100
t = t₁ + t₂ = 1/160 + 1/100 = 13/800
Vśr = S / t = 800/13 = 61,5 km/h