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389 kilometers per hour is about one-and-two-fifths times as fast as a Helicopter.
In other words, it's 1.370 times the speed of a Helicopter, and the speed of a Helicopter is 0.730 times that amount.
(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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