To calculate average speed, you measure how long it takes(T) to get from point A to point B. Then you use the formula below:
speed = (B - A)/T
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You can use a graph to calculate speed.
Speed = Distrance / time
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Not enough information. You can use the equation speed = frequency x wavelength, but in this case, you don't have enough data to calculate the speed.
I'm sure that average speed would be easier to calculate than instantaneous speed. To calculate average speed, just take the time that it takes to travel between two points, and divide that into the distance between the points.