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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).
All of those aircraft could cruise some 10 knots faster, by burning more fuel, but airlines nowadays like to cruise strictly at the lowest cost index (a little slower). A 787-800 and A350-900 normal cruise is Mach 0.85, but could cruise at Mach 0.87 by using more fuel.