I look at some of mine and think 'who was that guy' - but a lot of mine are actually from the same run - I'd been training on the full panniered out bike for the spanish trip (which isn't on strava but did have 120km ride in it) with mountains and what not, then I came home a week later and took the road bike on the flat to work with tailwind on a lovely day and set most of my lifetime speed records.i see strava now calculates your greatest hits;
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(turns out what i thought was my 115km ride was a 111km ride).
but those numbers will flatter; that 10k in fifteen and a half minutes was on a stretch which is a very gentle downhill but probably a good tailwind.
Your times are still a lot faster than mine though