x- distanta traseu
In prima zi: 2x/5 km
In a doua zi: 180 km
x/3 ramas
Deci suma distantelor din cele 3 zile(cele 2 zile si distanta ramasa):
2x/5+x/3+180=x
Aducem la acelasi numitor:
(2x*3+5x+180*15)/15=x
6x+5x+180*15=15x
11x+2700=15x
15x-11x=2700
4x=2700
x=675
675 km are traseul. :D