A bus traveling at an average rate of 30 miles per hour left

A bus traveling at an average rate of 30 miles per hour left the city at 11:45 A.M. A car following the bus at 45 miles per hour left the city at noon. At what time di the car catch up to the bus?

Solution

bus is 7.5 mi ahead
overtake speed is 15 mph
7.5/15=.5 hrs= 30 min