Problema 4 va rog
DAU COROANA

a + b + c = Drumul
a = 3/8 (3 optimi din drum)
b = 4/8
c = 4/8 - 60
Drumul = 8/8
a + b = 3/8 + 4/8 = 7/8
7/8 + c = 8/8 => c = 1/8
1/8 = 4/8 - 60 => 60 = 3/8 => 1/8 = 60:3 = 20
8/8 = 1/8 * 8 => Drumul = 20 * 8
=> Drumul = 160 km