JEE Main 23 Jan 2025 Shift 2 Paper

A spherical chocolate ball has a layer of ice-cream of uniform thickness around it. When the thickness of the ice-cream layer is 1 cm , the ice-cream melts at the rate of 81cm3∕min and the thickness of the ice-cream layer decreases at the rate of ‌

1

4π

‌cm∕min. The surface area (in cm2 ) of the chocolate ball (without the ice-cream layer) is: