A cyclist travels at 20 kilometers per hour when cycling uphill, 24 kilometers per hour when cycling on flat ground, and 30 kilometers per hour when cycling downhill. On a sunny day, they cycle the hilly road from Aopslandia to Beast Island before turning around and cycling back to Aopslandia. What was their average speed during the entire round trip? I don't get how some people just guessed their answers. Like, their numbers. Please specify every step and what led to those answers. Please dont leave out easy steps, and help quickly I don't get other explanations