t1=12h 30
t2=15h
d=120km
a) Δt=t2-t1=15h-12h30min=2h30min=2,5h
v(1)=d/Δt ⇔ v(1)=120/2,5=48km/h
b)t=1h
v(1)=d/t3 ⇔ 48= d/1 ⇔d=48km
Δt=15h-13h 30min=1 h 30 min = 1,5h
Δd=150-48=102km
v(2)=Δd/Δt=102/1,5=68km/h
c) iar graficul e o linie oblica de la stanga spre dreapta in sus