Răspuns:
5x/12 - a parcurs in prima zi
¹²⁾x-5x/12=(12x-5x)/12=7x/12 rest
7x/12·3/7=(21x/84)⁽²¹=x/4 - a parcurs a2a zi
5x/12+³⁾x/4+¹²⁾240=¹²⁾x
5x+3x+2880=12x
2880=12x-8x
x=2880:4=>x=720 km lungimea drumului
verificare:
5·720:12=300km prima zi
720-300=420 rest
3·420:7=180 km a2a zi
300+180+240=720 km lungimea drumului