*cough* Y'know, the polar-combustibility in congruence with the hypotenuse of the universe, minus the request of logic equals total infusion of confusion to the conversation. Basically, I can't help myself. O_O
Of course, it's often used as a trick question, as you have to regard many species and the climate, region, and habits of the swallow in question. Thus, I can only guess the velocity at around 22-24 mph.