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t₁=s₁/60
s₁=droga
s₂=s₁+20km
v₂=80km/h
t₂=4⅓h=¹³/₃-t₁
s₁+20=80(¹³/₃-s₁/₆₀)
s₁+20=¹⁰⁴⁰/₃-80s₁/60
60s₁+1200=20800-80s₁
140s₁=19600
s₁=19600:140
s₁=140 km
s₂=s₁+20=140+20=160km
przebyta droga=s₁+s₂=140+160=300km