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A snowbarder decends a 12000-ft hill in 3min. hat is the mean change in evlevation per min.
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A snowbarder decends a 12000-ft hill in 3min. hat is the mean change in evlevation per min.

User Spondbob
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If the snowboarder descends 12000 feet hill in 3 minutes, then in one minute he'll descend 12000 / 3 = 4000 feet. So the mean change in elevation per minute is 4000 feet per minute.
User Jerine
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