exam Maths Puzzle Numerical Ability

P(E)=0.30, P(F)=0.40,P(EnF)=0.1
P(EuF)=

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The volume of a right circular cone of radius r and height r is given by V= pi/3 x r^3. How fast is the volume changing with respect to the changes in r when the radius is equal to 2 feet?
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