human
There are 90 rooms at the KozyInn Motel. It takes housekeeping 20 minutes to clean each room. How many hours would it take to clean one-half of the rooms?
assistant
How many minutes does it take to clean all the rooms? ** 90 * 20 = <<90*20=1800>>1800 minutes
How many minutes does it take to clean half the rooms? ** 1800/2 = <<1800/2=900>>900 minutes
How many hours does it take to clean half the rooms? ** 900 minutes = <<900/60=15>>15 hours
How many hours would it take to clean one-half of the rooms? ** It would take 15 hours to clean 45 rooms at the KozyInn Motel.
#### 15