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s=4km
v=54km/h
Szukane:
t=?
V=s/t <----wzór ogólny(prędkość=droga/czas)
V*t=s/t *t
V*t=s
t=s/V
t=s/V=(4km)/(54km/h)=0,074h= 266,66s
4----x
x=60*4/54
x=4,(4) min