Răspuns :
Ziua 1: X/3
ramas X - X/3 = 2X/3
Ziua 2: (2X/3)/4 = X/6
Ziua 3: 18
X/3 + X/6 + 18 = X
3X/6 + 18 = X
X/2 + 18 = X
X = 36 km
ramas X - X/3 = 2X/3
Ziua 2: (2X/3)/4 = X/6
Ziua 3: 18
X/3 + X/6 + 18 = X
3X/6 + 18 = X
X/2 + 18 = X
X = 36 km
I zi - x/3=>A rămas 2x/3
II zi - (2x/3)1/4=2x/12=x/6
III zi - 18km
x/3 + x/6 + 18 = x
2x+x+108=6x
3x=108km
x=36 km