Răspuns:
|__|__|__|__|__|__|__|__|__|__| total
|__|__|__| 30% a =prima zi (30/100= 3/10)
|__|__|__|__|__|__|__| R=7/10restul dupa prima zi
|__| b= 1/7 *R- a doua zi
|__|__|__|__|__|__| c= 60 km= 6/7 din rest
[tex]\frac{6}{7} *R= 60[/tex] => R= 60x7: 6= 70 km restul
b= 1/7* R= 70 :7= 10 km ( a doua zi)
[tex]\frac{7}{10} *t= 70[/tex] => t= 70x10 :7= 700:7= 100 km total
a= 30%= 3*100: 10=300:10= 30 km prima zi
verificare 30+ 10 + 60 = 100 km total