Donkey Kong and Diddy Kong are keen cyclists. They are doing an 80 km time trial. Donkey sets off at 8 am. He cycles at 30 km/hour until he reaches the halfway point, where there is a steep hill. It takes him 30 minutes to cycle up the hill at 10 km/hour. At the top is the Banana Stand where Donkey stops for 25 minutes for a banana shake. He then continues at 25 km/hr until the end of the time trial. Diddy Kong leaves 45 minutes after Donkey. He cycles at a constant speed of 30 km/hour. At what time does Diddy pass Donkey?