You normally drive a 12 -h trip at an average speed of \(100 \mathrm{~km} / \mathrm{h}\). Today you are in a hurry. During the first two-thirds of the distance, you drive at \(108 \mathrm{~km} / \mathrm{h}\). If the trip still takes \(12 \mathrm{~h}\), what is your average speed in the last third of the distance?