Prima zi
|×××××××××|-10------------|------------|
A doua zi
|××××××|-10-----------|
A treia zi
|×××|-----|
Rest
|-50-|
Metoda mersului invers :
{[( 50 × 2 + 10 ) × 2 ] + 10 } : 2 × 3 =
{[( 100 + 10) × 2 ] + 10 } : 2 × 3 =
[(110 × 2) + 10 ] : 2 × 3 =
( 220 + 10 ) : 2 × 3 =
230 : 2 × 3 =
115 × 3 = 345 km (total)