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t1=1,5h
v1=60km/h
s=v*t=90km
v2=18km/h
t2=s/v=5h
t- 1 i 1/2h = 3/2h | t-?
v- 60km/h | v- 18km/h
trasa samochodu=trasa roweru ,a więc:
3/2h * 60km/h= 18km/h *t
90h=18*t (jednostki się skracają)
t= 90h : 18
t=5
t roweru = 1 i 1/2h * 5= 7.5h
odp. Rowerzysa, aby pokonać tę trasę potrzebuje 7.5h.
:)