A boeing 747 aircraft weighing 580,000 lb when loaded with fuel and 100 passengers takes off with an airspeed of 140 mph. with the same configuration (i.e., angle of attack, flap settings, etc.), what

A boeing 747 aircraft weighing 580,000 lb when loaded with fuel and 100 passengers takes off with an airspeed of 140 mph. with the same configuration (i.e., angle of attack, flap settings, etc.), what is its level flight speed if it is loaded with 366 passengers