Respuesta :

irspow
18s(1.75hr/5s)=6.3hr  (6hr 18min)

If it takes him 1.75 hours to paint five section, it means it takes him 1.75/5=.35 hours per section

He has 18 sections to paint so it will take him 18 times as much to paint them all, 18*.35=6.3 hours