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You can’t really measure how steep a mountain range is that way. You have to look at individual slopes. If you went from the base of the range to the highest peak, it’s highly dependent on from what edge you measure from. Here is an example:
As you can see, if you were selective of how you measured it, through that method you could conclude that Mauna Kea is much steeper than the Himalayas, which is not true at all. Even if you measured the fastest elevation change from the base of the Himalayas to the peak of Mt. Everest it would only come out to be about 415ft/mi, which is still not as steep as our measure of Mauna Kea. And if you were to measure from the closest point on the Tibetan plateau you get 260ft/mi.
A more reasonable measure would be to measure the slope from the bottom of every mountain valley to every adjacent ridge/peak. If we measured this way, we get the same value for Mauna Kea (650ft/mi), and Mt. Everest would come out to 4000ft/mi