Last updated at May 29, 2018 by

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Example 11 A hemispherical tank full of water is emptied by a pipe at the rate of 34/7 litres per second. How much time will it take to empty half the tank, if it is 3m in diameter?(Take = 22/7) Volume of tank Tank is in form of hemisphere with Diameter = 3m So, radius = r = 3/2 m Volume of the tank = 2/3 3 = 2/3 22/7 (3/2)^3 = 2/3 22/7 (3 3 3)/(2 2 2) = 99/14 m3 = 99/14 1000 litres = 99000/14 litres Volume of water to be emptied = 1/2 Volume of tank = 1/2 99000/14 litres = 99000/28 litres Now, it is given that tank is emptied at 34/7 litres per second = 25/7 litres per second Time taken to empty 25/7 litres = 1 second Time taken to empty 1 litre = 1 7/25 second Time taken to empty 99000/28 litre = 7/25 99000/28 = 693000/700 = 990 second = 990/60 minutes = 16.5 minutes

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Example 11 Important You are here

Example 12 Important Deleted for CBSE Board 2022 Exams

Example 13 Deleted for CBSE Board 2022 Exams

Example 14 Deleted for CBSE Board 2022 Exams

Surface Area and Volume Formulas Important

Chapter 13 Class 10 Surface Areas and Volumes (Term 2)

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About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 10 years. He provides courses for Maths and Science at Teachoo.