A man runs 650 m east and then turns and runs 850 m west. This takes him 240 seconds. What is the man’s average SPEED for the run?

6.25 m/s

Explanation:

The average speed of an object is the ratio of the total distance traveled by the object and the total time taken to cover the distance. Mathematically,

Average speed = total distance traveled/total time taken.

In this case;

Total distance traveled = 650 + 850 = 1500 m

Total time = 240 s

Average speed = 1500/240 = 6.25 m/s

The average speed of the man is, therefore, 6.25 m/s.