Poetry uses forms and conventions to suggest differential interpretation to words, or to evoke emotive responses. Devices such as assonance, alliteration, onomatopoeia and rhythm are sometimes used to achieve musical or incantatory effects.
The average speed of an object tells you the (average) rate at which it covers distance. If a car's average speed is 65 miles per hour, this means that the car's position will change (on the average) by 65 miles each hour.
Running (activity) The average running speed of a healthy adult human is probably somewhere in the range of 10-15 miles per hour. This would be a measure of the average peak speed of every healthy adult human on the planet, regardless of gender, age, or size. Usain Bolt has been clocked at over 28mph, and scientists say that it is theoretically possible for humans to reach footspeeds of over 40mph. Humans Could Run 40 mph, in Theory.