Relative means comparison to. Thus the concept of relative speed is used when two or more bodies moving with some speed is considered. To make things simpler one body can be made stationary (i.e. speed= 0) and the speed of the other body with respect to the stationary body, which is the some of the speed if the bodies are moving in the same direction. This speed of the moving body with respect to the stationary body is called Relative Speed.
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