Final answer:
The bicyclist's average speed was calculated by dividing the distance traveled (20 kilometers) by the time taken (0.5 hours), resulting in an average speed of 40 km/h.
Step-by-step explanation:
The student has asked how to calculate the average speed of a bicyclist who traveled 20 kilometers in one-half hour. To determine this, we use the formula for average speed, which is the total distance traveled divided by the total time taken.
Since the bicyclist traveled 20 kilometers in 0.5 hours (which is one-half hour), the average speed, Vavg, can be calculated as:
Vavg = distance / time = 20 km / 0.5 h = 40 km/h.
Therefore, the bicyclist's average speed was 40 km/h.