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Vs - prędkość statku
Vs + Vr = 18
Vs - Vr = 14
Vs + Vr + Vs - Vr = 18 + 14
2Vs = 32
Vs = 32/2 = 16 km/h
Vs + Vr= 18
16 + Vr = 18
Vr = 18 - 16 = 2 km/h
szybkość prądu rzeki 2 km/h
szybkość statku 16 km/h