The radius of the base of a cone is incr...

The radius of the base of a cone is increasing at the rate of 3 cm/min and altitude is decreasing at the rate of 4 cm/min. The rate of change of lateral surface when the radius is 7 cm and altitude is 24 is

`63pi` sq.cm/min

`84pi` sq.cm/min

`72pi` sq.cm/min

`96pi` sq.cm/min

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