5 friends rented a badminton court from 2 p.m. to 3.45 p.m. They took turns to play badminton on the court. At any time, 4 of them played on the court while the remaining friends watched. Given that each of them had the same amount of playing time, how many minutes did each person play on the court?
60 + 45 = 105
105/5 = 21 minutes