Police officer A patrols 36 streets in 4 hours. His colleague, officer B, patrols 55 streets in 5 hours. How many streets will both officers patrol in one hour?
Officer A patrols 36 streets / 4 hours = <T>divide(36, 4)=9.0 streets/hour.
Officer B patrols 55 streets / 5 hours = <T>divide(55, 5)=11.0 streets/hour
Together officer A and B patrol 9 streets/hour + 11 streets/hour = <T>add(9, 11)=20 streets/hour.
