Dupa 15 minute!
DEMO:
RS parcurge ''n'' Km in acelasi timp (t) in care MM parcurge ''n+30'' Km.
V(RS)=30Km/10min.=30Km/(1/6)h=180Km/h
V(MM)=30Km/6min.=30Km/(1/10)h=300Km/h
t=distanta/viteza
t=d(RS)/V(RS)=t(MM)/V(MM)
n/180=(n+30)/300
300n=180(n+30) l :60
5n=3(n+30)
5n=3n+90
2n=90
n=45 Km
Cand MM parcurge 75Km, RS parcurge 45Km (cu un tur in minus).
t=75Km/300Km/h=(1/4)h=(1/4)x60min.=15minute
t=15 minute