I----I----I----I----I----I----I----I----I drumul 8 segmente
I----I----I 1 zi = 2segmente
I----I----I----I a 2-a zi = 3 segmente
I----I----I----I a 3-1 zi = 3 segmente
total 8 segmente =intregul drum
ecuatie
a=km
2a/8
2a/8+a/8=3a/8
3a/8
2a/8+3a/8+3a/8=8a/8 =a
a parcurs intrgeul drum