African or European?

Dave Doerr, an old college roommate, showed me this – very cool:
 

Jack says:

what is the average airspeed of an unlayden swallow?

Encarta® Instant Answers says:

What do you mean? An African or a European swallow?

Jack says:

African

Encarta® Instant Answers says:

Based on recent scientific studies, the average cruising airspeed velocity of an unladen African Swallow is roughly 11 meters per second, or 24 miles an hour.

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