x = lungimea traseului
I zi: 30/100 * x => rest = 70/100 * x (expl. 100-30/100 * x = 70/100 * x)
II zi: 1/2 * 70/100 * x (rest) => rest = 35/100 * x (expl. 1/2 * 70 = 35)
III zi: 35/100 * x = 350 (restul = 350)
35/100 * x = 350
x = 350 : 35/100
x = 350 * 100/35
se simplifica 350 cu 35
x = 10 * 100
x = 1000 km
sper ca te am ajutat
