My son says that he thinks you measure grade this way
The distance travelled in height/altitude every 100 metres... therefore, the hill just before I get home which climbs at about 11 metres per 100 metres is an 11% gradient.
It makes me feel like vomiting by the time I get to the top... but at least I can get to the top... now... at about 7km/hour (about 4 1/2 miles per hour)
Then a gentle 1km slope to get rid of the lactic acid before I reach my gate



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