JEE Main 202225 Jun, Evening shiftMathematicsMediumLimit, Continuity and Differentiability420× since 2002
Water is being filled at the rate of 1 cm³ / sec in a right circular conical vessel (vertex downwards) of height 35 cm and diameter 14 cm. When the height of the water level is 10 cm, the rate (in cm² / sec) at which the wet conical surface area of the vessel increases is