An airplane was flying at a height of 1700m. To land, it started descending by losing height of 80m every minute. How long will it take to descend 1000m?

the answer to the question is . I hope it is  ( -78300)
 
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sorry it is -78300 minutes
 
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In 12 minutes, the plane will have descended 960 m. In 13 minutes, the plane will have descended 1040 m.
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