We are amature runners and usually run
~10 minutes/mile for long runs.
(Some of us run faster than that, but, it is easier to slow down than to speed up ¯\_(ツ)_/¯.)
9e-9c means 9e-9 × c, which is about 10 minutes/mile.
We want to create useful Web Apps to help runners/hikers/... to enrich their videos.