/__________/_+7/____________/
r1 /_______/+15/________/
r2/____/+27/___/
r3/_50_/
50+27=77(jumatate r2)
77×2=154valoare r2-cat a mers a treia zi)
154+15=170(jumatatea r2)
170×2=340km a parcurs a doua zi)
340+7=347(jumatatea traseului)
347×2=694km a avut traseul
694-50=644km a parcurs in 3 zile