This a very vague question, but what kind of 5km time would you expect from someone running a 40 minute 10km? I seem to remember someone mentioning a formula of %5 for doubling the distance. No idea if that’s right, but 19 min 5km for a 40 min 10km seems like a reasonable conversion.
Finger in the air estimate of 18:30-18:45
I ran 40.03 at the London 10000 and 5k last week of 19 dead
Your calculations have some anecdotal evidence
Jack Daniels' VDOT Calculator says 19:19
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