lungimea intregului drum
|--------|--------|--------|--------|
in prima zi a parcurs
|--------|
restul ramas de parcurs
|----|----|----|----|----|----|
a doua zi a parcurs
|----|----|----|----|----|
a ramas de parcurs
|----| 28 km
28 × 5 = 140 km a doua zi
6 × 28 = 168 km (restul)
168 : 3 = 56 km in prima zi
4 × 56 = 224 km lungimea intregului drum
__________________________________
Verificare :
56 + 140 + 28 = 224 km
