Harmonic+Mean+-+Gadiel

Examples:
 * Harmonic Mean is a math formula used to find the average or RATES when the reciprocals of the numbers add up.**

The mean speed of a car that goes the same distance (not time) at each of several speeds, then the total time taken is found by dividing the common then adding up those **times**. The constant speed that would take the same total time for the whole trip is the HARMONIC mean of the speeds
 * distance** by each **speed** to get the time for that leg of the trip, and

if a vehicle travels a certain distance at a speed x (e.g. 60mph) and then the same distance again at a speed y (e.g. 40 mph), then its average speed is the harmonic mean of x and y (48 mph), and its total travel time is the same as if it had traveled the whole distance at that average speed (48mph).

Harmonic mean can also be applied to medicine and economics (in purchases of shares) among others.