Notam distanta parcursa in prima zi cu x.
In a doua zi parcurge distanta 4x
In a treia zi parcurge distanta 4x+8 = 40 km
Atunci 4x = 40-8 = 32 km
x = 32:4 = 8 km
Distanta parcursa in prima zi = 8 km
Distanta parcursa in a doua zi = 4x8 = 32 km
Distanta parcursa in a treia zi = 32+8 = 40 km
In total, drumul are lungimea de 8 + 32 + 40 = 80 km