Plug the distance into the formula. He comes back from B to A at different speed say y miles per hour. Average speed total distance total time The most common units of measurement for average speed are kph or kilometers per hour mph or miles per hour ms or meters per second and fts or feet per second.
The average speed of an object is the total distance traveled by the object divided by the elapsed time to cover that distance.
To get distance D D multiply speed times the amount of time. Distance Rate Time. Averagespeed frac totaldistancetravelled totaltimetaken average speed 2000 125. Average Speed Formula - Examples.