Final answer:
The average speed of the man who walks for one minute at 1 m/s and then runs for another minute at 3 m/s is 2 m/s. This is calculated by dividing the total distance traveled (240 meters) by the total time taken (120 seconds).
Step-by-step explanation:
The question asks us to calculate the average speed of a man who walks for one minute at 1 meter per second (m/s) and then runs for another minute at 3 meters per second (m/s). To determine the average speed, we add up the total distance traveled and divide it by the total time taken.
In the first minute of walking at 1 m/s, the man covers 1 m/s * 60 s = 60 meters. During the second minute of running at 3 m/s, he travels 3 m/s * 60 s = 180 meters. The total distance covered is therefore 60 m + 180 m = 240 meters. The total time taken is 2 minutes or 120 seconds. The average speed is then 240 meters / 120 seconds = 2 m/s.