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Solution :

Volume of sphere is given by <br> `V=(4)/(3)pir^(3)` <br> Differentiate with respect to time <br> `(dV)/(dt)=(4)/(3)pi xx 3r^(2)""(dr)/(dt)` <br> `implies (dV)/(dt)=4pir^(3)""(dr)/(dt)` <br> `implies (dr)/(dt)=((dV)/(dt))/(4pir^(2))=(20)/(4pixx25)=(1)/(5pi)` cm/ second .