Where Ive used the binomial expansion. Distance rate x time. Insert also your running distance and select the unit you want to use for distance.
It is far easier to work out the answer when speed is expressed as miles per minute.
Time Distance speed. Use this trick as a speed calculator to work out speed maths. Or quicker and dirtier. For instance if your average drive distance is 202 yards your average club head speed is 202 divided by 23 or approximately 878 mph.