The radius of a cylindrical cistern is 10 metres and its height is 15…

Question

The radius of a cylindrical cistern is 10 metres and its height is 15 metres. Initially the cistern is empty. We start filling the cistern with water through a pipe whose diameter is 50 cm. Water is coming out of the pi…

Accepted Answer

Option D. 80 min. Answer & Solution Answer: Option D Solution: Volume of cistern : & = ( × 10^2 × 15 )m^3 & = 1500 m^3 Volume of water flowing through the pipe in 1 sec : & = ( × 0.25 × 0.25 × 5 )m^3 & = 0.3125 m^3 ∴ Time taken to fill the cistern : & = ( 1500 0.3125 ) & = ( 1500 × 100003125 ) &…