Technically speaking, if two workers get the same wage to work different hours the only who works the less have a higher hourly wage. It's just a... different reasoning I guess
What you are talking about is called partial time job and can't exceed 30 working hours a week. This system doesn't allow overtime if you work more than 26 hours a week and is overall uncommon (not all unions allow this hiring system)
The legal minimum wage is thus defined for a working month of 220 hours and 30 days. Hence with a 1100 BRL minimum wage you get effectively 5 BRL each hour
In partial job system someone working only 20 hours a week you get a wage proportional to your working hours, using a 30 days month X 4 hours a day X 5 BRL per hour so you get a 600 BRL wage
Yeah so the one working more just gets screwed over with unpaid overtime. If a European employer tried to make their employees work an extra 8 hours a week for free then they'd get sued so fast!
Why not just have a 5BRL per hour minimum wage? Seems like it would be more fair for everybody.