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  1. Chapter 1 Class 7 Integers
  2. Serial order wise
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Ex 1.4, 7 An elevator descends into a mine shaft at the rate of 6 m/min. If the descent starts from 10 m above the ground level, how long will it take to reach 350 m. Total distance elevator has to travel = Initial position final position = 10 ( 350) = 10 + 350 = 360 m Now, Elevator descends at rate 6m / min Elevator travels 6 m in = 1 minute Elevator travels 1 m in = 1/6 minute Elevator travels 360 m in = 1/6 360 minutes = 60 minutes = 1 hour It will take the elevator 1 hour.

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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.