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Almost all airplanes hit the runway vertically less than a 100 feet per minute, which is like less than traveling 2 feet per second. However, the horizontal speed varies greatly. Glides can land at speeds below 40 mph, while large comerical airliners will land at around 150-170 mph. It depends on the design of the wing, the wing loading, and most importantly, when it will stall. Almost all aircraft basically stall (sometimes fully, sometines partically) upon landing.
The 757-200 will generally touchdown with a speed of around 125 kts. The 767 is about 10 knots faster than this. Depends on how you define commercial. Two seat Cessna 152 used by a flight school for instruction is technically commercial and its landing speed is around 60 knots. An airliner such as Boeing 777 or a corporate jet such as Citation usually touches down around 150ish knots indicated airspeed (KIAS).