You need about 1 one half hours to setup a computer work station. How many hours should it takes to set up 7

So it takes half an hour to set up a computer work station. half an hour = 30 minutes. so we know 2 half hours = 1 hour. so 7-2=5 so 1 hour 5-2=3 s0 that makes 2 hours. 3-2=1 so that would be 3 and a half hours or 3.5