Răspuns:
x=lungimea traseului
x/5 -strabate in prima zi
⁵⁾x-x/5=4x/5 rest
4x/5·1/3=4x/15 strabate a2a zi
x-(³⁾x/5+4x/15)=¹⁵⁾x-7x/15=8x/15 noul rest
8x/15·1/2=8x/30 strabate a3a zi
⁶⁾x/5+²⁾4x/15+8x/30+³⁰⁾24=³⁰⁾x
6x+8x+8x+720=30x
720=30x-22x
x=720:8
x=90 km lungimea drumului
verificare:
90:5=18 km strabate in prima zi
90-18=72 rest
72:3=24 km strabate a2a zi
90-(18+24)=48 noul rest
48:2=24 km strabate a3a zi
18+24·3=90 km lungimea traseului
