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11,680 furlongs per fortnight is about one-forty-fifth as fast as an Arrow (archery)
In other words, it's 0.02166 times the speed of an Arrow (archery), and the speed of an Arrow (archery) is 46.170 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 539,200 furlongs per fortnight when fired from a 60-lb, 28-inch draw bow . Archeological evidence from the Ahrensburg valley near Hamburg, Germany indicates that arrows have been used since at least 11 to 12,000 years ago.
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