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2 etap - x + 30
3 etap - x + 60
wszystkie etapy - 660
x + (x + 30) + (x + 60) = 660
3x + 90 = 660
3x = 570
x = 190
x + 30 = 220
x + 60 = 250
Odp: Etapy mają kolejno 190km, 220km i 250km