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t=czas=5 minut
s=droga
s=v*t
s=1/10km/min *5 min=1/2km
5min-1min=4min
v=s/t
v=1/2km : 4min=0,125km/min z taką szybkoscia musiałby dreptać
0,125km/min=1/8 km/min
1/8km/min-1/10km/min=5/40km/min-4/40km/min= musiałby zmniejszyć predkośc o 1/40km/min