2 min = 1/30 h
1 min 40 s = 1/36h
v1= 4,8km / 1/30h = 144 km/h
v2 = 4,8 km / 1/36h = 172,8 km/h
v rzeki = 172,8 - 144 = 28,8 km/h
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2 min = 1/30 h
1 min 40 s = 1/36h
v1= 4,8km / 1/30h = 144 km/h
v2 = 4,8 km / 1/36h = 172,8 km/h
v rzeki = 172,8 - 144 = 28,8 km/h