"Water is dripping out from a conical funnel of semi-vertical angle `pi/4` at the uniform rate of
Channel: Doubtnut
Date: 2020-07-05

"Water is dripping out from a conical funnel of semi-vertical angle `pi/4`
 at the uniform rate of `2c m^2//s e c`
 in its surface area through a tiny hole at the vertex in the bottom. When
 
  the slant height of the water is 4cm, find the rate of decrease of the slant
 
  height of the water."