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).