Răspuns :
fie x lungimea drumului
5/12 x + 20 = 1/2 x ( aducem la acelasi numitor ) =>
5x + 240 = 6x
240 = x x = 240 km
5/12 x + 20 = 1/2 x ( aducem la acelasi numitor ) =>
5x + 240 = 6x
240 = x x = 240 km