The 3 cars take 3*40=<<3*40=120>>120 minutes to make
He repairs 5-3=<<5-3=2>>2 more cars
They each take 40*.5=<<40*.5=20>>20 minutes longer per car
So they each take 40+20=<<40+20=60>>60 minutes
So he repaired cars for 120+2*60=<<120+2*60=240>>240 minutes
That is 240/60=<<240/60=4>>4 hours
So he made 4*20=$<<4*20=80>>80
#### 80