John plays at the arcade for 3 hours.  He uses $.50 for every 6 minutes.  How much money did he spend, in dollars?
He was at the arcade for 3*60=<T>multiply(3, 60)=180 minutes
So he put coins in 180/6=<T>divide(180, 6)=30.0 times
That means he spent 30*.5=$<T>multiply(30, 0.5)=15.0
