Răspuns:
100km = 6l
50km = 6l : 2 = 3l
150km = (100km + 50km) 6l + 3l = 9l
15l = (6l + 6l + 3l) 100km + 100km + 50km = 250km
350km = (150km + 150km + 50km) 9l + 9l +3l = 21l
[28.5l]
25km = (50km : 2) 3l : 2 = 1.5l
28.5l = (21l + 6l + 1.5l) 350km + 100km + 25km = 475km
