1) |_____|_____|___________________________|
|_____|_____|+120
2) |______|______|______|______|
|______|+60
3) |_____|______|______|
|_____|+180
4) |__________| = 240 km
240 km + 180 km = 2/3
420 km = 2/3 => 3/3 = 420×3/2 = 630 km
630km + 60 km = 3/4
690 km = 3/4 => 4/4 = 690×4/3 = 920 km
920 km + 120 km = 5/7
1040 km = 5/7 => 7/7 = 1040×7/5 = 1456 km (lungimea traseului)
