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This is because speed is defined as the absolute value of velocity - irrespective of the direction of motion.
When the length of the time is decreased more and more ,average velocity of the particles equals instantaneous velocity.
Velocity is a vector, which means it has a direction, but speed isn't. Speed is the absolute value of velocity. Velocity can be negative, meaning that the speed is opposite to the direction that you're calling the positive direction.
In physics, total distance/TIME is average speed, so this is false. Velocity should be switched out with TIME.