Mark spent 220 dollars to fix his car.  It needed two parts that cost 20 dollars each, and labor cost .5 dollars a minute. How many hours did the mechanic work?
Labor cost is .5*60=<<.5*60=30>>30 dollars per hour
The cost for parts is 20*2=$<<20*2=40>>40
The total cost for labor is 220-40=$<<220-40=180>>180
He spent 180/30=<<180/30=6>>6 hours on labor.
#### 6