If you drive 120 km at 60 km/h and then another 120 km at 40 km/h, your average speed is not 50 km/h. It is 48 km/h. The gap surprises many people, and it shows why average speed needs more care than a simple add-and-divide.
This article explains the correct method, shows when the simple average does work, and covers a few travel calculations that tend to go wrong.
The definition that never...
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