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859.4 kilometers per hour is about two-and-a-half times as as an Arrow (archery).
In other words, it's 2.662 times the of an Arrow (archery), and the of an Arrow (archery) is 0.3757 times that amount.
(250 g arrow fired from 60#/28" bow)
A 250 gram arrow will reach speeds of approximately 322.8 kph 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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