JEE Main 20209 Jan, Morning shiftMathematicsMediumLimit, Continuity and Differentiability420× since 2002
A spherical iron ball of 10 cm radius is
coated with a layer of ice of uniform
thickness the melts at a rate of 50 cm³/min.
When the thickness of ice is 5 cm, then the rate
(in cm/min.) at which of the thickness of ice
decreases, is :