###Human: John repairs 5 cars.  3 of the cars take 40 minutes each to repair.  The remaining ones take 50% longer each to repair.  He makes $20 per hour repairing cars.  How much money does he make?, ### Assistant: The 3 cars take 3*40=120 minutes to make
He repairs 5-3=2 more cars
They each take 40*.5=20 minutes longer per car
So they each take 40+20=60 minutes
So he repaired cars for 120+2*60=240 minutes
That is 240/60=4 hours
So he made 4*20=$80 
 So the answer is :  80