Minimum fuel reserve for VFR day is (FAR 91.151). There must be enough fuel to fly to 1st point of intended landing and 30 mins beyond (day) or 45 mins beyond (night) assuming normal cruise speed.
Large commercial aircraft, such a Boeing 747, often cruise at a speed of between 475 and 500 knots (roughly 575 mph). A Cessna Citation X, in contrast, boasts a cruise speed of 604 mph.
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