Originally Posted by LarryJ

250kts is the maximum speed allowed below 10,000', it is not an approach speed. No airliner flies it's final approach at anything anywhere near 250kts. An MD80 with a complete flaps/slats failure would fly final at around 190kts.

The ground speed is higher landing at a high-elevation airport because of the lower density of the air. The airspeed is the same as at lower-elevation airports but that same 140kts, for example, produces a higher ground speed at higher-elevation airports. 140kts at sea-level would be 154kts at 5,500'.