coffeeem.livejournal.com ([identity profile] coffeeem.livejournal.com) wrote in [personal profile] ellenkushner 2011-07-07 09:37 pm (UTC)

A quick Google ("travel by horse carriage speed") produced this, and this for bursts of speed rather than sustained mileage.

So, yes, you were correct. I expect only slightly more determined Googling could produce whatever refinement of the answer one might need!

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