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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

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Question of Exercise-4

Integers of Class 7

Question
Suppose we represent the distance above the ground by a positive integer and that below the ground by a negative integer. An elevator descends into a mine shaft at the rate of 5 metres per minute. What will be its position after one hour?

Answer: Position of the elevator after 60 minutes = (–5) × 60 = – 300 m, i.e., 300 m below ground level.
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