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Suppose we represent the distance above the ground by a positive integer and that below the ground by a negative integer. then answer-

An elevator descends into a mine shaft at a rate of 5m per minute, If it begins from 15 m above the ground, what will be its position after 45 minutes?


The position of the elevator after 45 mins will be 210 m below ground.
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Its position=5*45-15
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