We had a new Financial Controller introduced at work (by email - because she's based in the USA). The message said "she has an MBA so ask her tough questions". Being ever professional I asked her what the velocity of an unladen swallow was!
She sent back a brilliant reply and included a link to this excellent site that talks about "Strouhal equations for cruising flight" and such like. Apparently the answer (at least for the "European" variety) is is roughly 11 meters per second, or 24 miles an hour!
Of course this is for normal cruising flight. When they are hunting they go at roughly mach2.5 as testified by the difficulty I've had in various attempts to take a photograph of them!!
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