Răspuns :
x - lungime drum
x- x/4 = (4x- x)/4 = 3x/4
=> 3x/4 = 90 => x =( 4x 90 )/ 3 = 360 / 3 = 120 km are tot traseul
x- x/4 = (4x- x)/4 = 3x/4
=> 3x/4 = 90 => x =( 4x 90 )/ 3 = 360 / 3 = 120 km are tot traseul