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  1. Chapter 1 Class 7 Integers
  2. Serial order wise
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Ex 1.1, 4 A plane is flying at the height of 5000 m above the sea level. At a particular point, it is exactly above a submarine floating 1200 m below the sea level. What is the vertical distance between them? Distance of plane from sea level = +5000 m Distance of submarine from sea level = −1200 m Distance between them = 5000 − (−1200) = 5000 + 1200 = 6200m ∴ Distance between them is 6200 m

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Davneet Singh
Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 8 years. He provides courses for Maths and Science at Teachoo. You can check his NCERT Solutions from Class 6 to 12.