p + g + s = 30
p = g : 3
s = g : 2
g/3 + g + g/2 = 30
2g + 6g + 3g = 180
g = 180 : 11
g = 16,36 t
p = 16,36 : 3
p = 5,46 t
s = 16,36 : 2
s = 8,18 t
16,36 + 5,46 + 8,18 = 30 t
2.
12 * 24 h = 288 h
12 : 3 = 4 zile in care a facut popas
4 * 4 h = 16 h popas
288 - 16 = 272 h a navigat