Rate of change of quantities, error and approximationMedium
Related Rates in Spherical Geometry
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 81 cm3/min and the thickness of the ice-cream layer decreases at the rate of 
cm/min. The surface area (in cm2) of the chocolate ball (without the ice-cream layer) is :
cm/min. The surface area (in cm2) of the chocolate ball (without the ice-cream layer) is :SELECT ONE OPTION
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