The run of the mill boarder will ride in the mid 20's (mph) and push 30 on faster runs. Good intermediate riders will see a top end of 40-50 mph and will ride most groomed runs in the low to mid 30s. It is difficult to do much more than low 30s at a crowded resort as colission risk increase with speed and other skiers and riders may be far less predictable. Likewise snow conditions will be a big part of speed - hard pack usually being the fastest and warm sticky powder the slowest.
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This question depends a lot on the region (steepness of the mountains,) the difficulty of the run, and if there are bumps or if it is a speedy run; but in general, an intermediate skier goes around 15-20mph on a straight unimpeded run.
The skill level of the skier would have a lot to do with how fast he or she could go. However, professional skiers often reach speeds of 90 to 100 miles per hour on downhill runs.
About 35 to 40 Km/h. They run a 250 m, long course in about 25 secs. average, which is 36 km/h