v sr = Sc / tc
tc= t1 + t2 = 3 h + 3 h = 6h
S c =8 km/h x 3 + 5km/h x 3 h = 24 km + 15 km =39 km
vśr = 39 km/ 6 h = 6,5 km/h
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v sr = Sc / tc
tc= t1 + t2 = 3 h + 3 h = 6h
S c =8 km/h x 3 + 5km/h x 3 h = 24 km + 15 km =39 km
vśr = 39 km/ 6 h = 6,5 km/h