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A person walks first at a constant speed of 5.00m/s along a straight line from point A to point B and then back along the line from B to A at a constant speed of 3.00m/s.

What is the average speed and average velocity?

I pretended that point A to B is 15m and calculated that the average speed would be 3.75s

Is there another way to calculate the speed if I had not made up a distance from A to B?

Also, what would the velocity be? Would it be the same as the speed? Since the velocity would be +5.00m/s for the first part then -3.00m/s how do I calculate the velocity?