A rock climber’s elevation above sea level changed −82 1/2 feet in 2 1/4 minutes as she descended.What was the climber’s average change in elevation per minute? Enter your answer as a mixed number,

A rock climber’s elevation above sea level changed −82 1/2 feet in 2 1/4 minutes as she descended.

What was the climber’s average change in elevation per minute?  

Enter your answer as a mixed number, in simplified form, in the box. 

Please help me as soon as possible!!! Thanks!

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