Final answer:
The cyclist's average speed was 20 km/h, calculated by determining he covered 60 km in 3 hours after passing a 1 km marker every 3 minutes.
Step-by-step explanation:
The student rode his bike for 3 hours, and he passed a 1 km marker every 3 minutes, so we need to calculate his average speed. To find the average speed, we divide the total distance traveled by the total time taken. First, we find out how many 3-minute intervals there are in 3 hours:
3 hours x 60 minutes/hour = 180 minutes
180 minutes / 3 minutes per km = 60 km
So the cyclist covered 60 km in 3 hours. To get the average speed in km/h, we divide the distance by the time:
60 km / 3 h = 20 km/h
Therefore, the cyclist's average speed was 20 km/h.