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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.
They know how fast the airplane used on that flight goes. Airplanes do not not have to fly slower on shorter flights in general (unless they are flying under 10,000 feet). A jet will travel almost twice fast as a turbo prop (jet driven propeller). The commuter was probably a turbo prop.