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In kinematics, the speed of an object is the magnitude of its velocity
(the rate of change of its position); it is thus a scalar quantity 
When
we travel in a vehicle the speed of the vehicle changes from time to
time depending upon the conditions existing on the road. In such a
situation, the speed is calculated by taking the ratio of the total
distance traveled by the vehicle to the total time taken for the
journey. This is called the average speed. 
The definition for average speed is the following: the distance traveled
divided by the amount of time taken to make the journey, not including
any stops or breaks.