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Prędkość łodzi pod prąd: v_b - v_c = 8 km/h, z prądem: v_b + v_c = 12 . Znajdź
Prędkość łodzi pod prąd: v_b - v_c = 8 km/h, z prądem: v_b + v_c = 12 . Znajdź
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