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Best Answer: 747-100 - Max speed 967km/h (522kt), economical cruising speed 907km/h (490kt). Range with 385 pax and reserves 9045km (4880nm). 747-200B-Max speed 981km/h (530kt) (with RR engines), economical cruising speed 907km/h (490kt). Range (CF6-80C2 engines) with 366 pax and reserves 12,778km (6900nm).
Assuming fuel is not a concern: The circumference of the earth is 24,901 miles at the equator. If you board a Boeing 747, the average cruise speed is 565mph [1]. Assuming you fly in a straight line: 24,901 miles / 565mph = 44.07 hours.