<oembed><type>rich</type><version>1.0</version><author_name>Tobias Denkinger (npub1sr…hf9qm)</author_name><author_url>https://nostr.ae/npub1srxyarmjhgdsppa8eqhtxjmnm9cuw2yc4nvaf0zs7lduut42grmsfhf9qm</author_url><provider_name>njump</provider_name><provider_url>https://nostr.ae</provider_url><html>I am probably missing the point here, but you cannot really convert between mph and min/mile.  The first one is a unit of [speed] = [distance] / [time] and the second one is a unit of [time] / [distance].  (You swapped NGP and FTP in the last equation, so the end result is fine.)</html></oembed>