138 knots average
Maximum takeoff weight for a Boeing 757-300 is 123,600 kg (272,500 lb)
150 knots
155 knot average
Its top speed, according to Boeing, is 609 mph
The Boeing 757 comes in two main variants; An empty 757-200 weighs 63 tons (127,550lbs) and has a maximum takeoff weight of 127.5 tons (255,000lbs). The 757-300 wieghs 71 tons empty (142,400lbs) with a maximum takeoff weight of 136.25 tons (272,500lbs).
it is commonly 140 mph on average
757
the cost of a Boeing 757-200 is $65 million and the cost of a 757-300 is $80 million
I just flew from MI to AK on a Boeing 757-300. While we were on the Tarmac I occupied myself by reading the safety literature that is found in the pocket of the seat back in front of you. In it they had all of the 757 series planes and the average speed was 528 MPH
It honestly depends on what type of 757 you use. 757-200, -200F, -200WL, or -300 Boeing 757-200: 3,900 nautical miles Boeing 757-200F: 3,150 nautical miles Boeing 757-200WL: 4,100 nautical miles Boeing 757-300: 3,467 nautical miles
747
Mach 0.80 (530 mph or 458 knots) at 35,000 ft.