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Correction for the speed of a Helicopter

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How fast is 171 kilometers per hour?
It's about three-fifths as fast as a Helicopter
The speed of a Helicopter is about 284 kilometers per hour.
(for AH-64A Apache, a.k.a. Hughes Model 77) (maximum cruise speed)
The AH-64 helicopter, one of the primary helicopters used by the United States Army, flies at a top cruise speed of 284 kph. The AH-64 is the primary military helicopter of several nations including the United States, the United Kingdom, Israel, Japan, and the Netherlands.
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