If u want the formula to calculate average speed:
total distance/total time
Sometimes the speed of an object need not be constant. In most cases, the objects will be in non-uniform motion. Therefore, we describe the rate of motion of such objects in term of their average speed. The average speed of an object is obtained by dividing the total distance travelled by total time taken. That is,
average speed = Total distance travelled
                         Total time taken
if and object travels a distance s in time t then its speed v is,
                        v = s/t 
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