A spherical iron ball 10 cm in radius is...

A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness that melts at a rate of `50 cm^(3)//min.` When the thickness of ice is 5 cm, then the rate at which the thickness of ice decreases, is:

`1//54pi` cm/min

`5//6pi` cm/min

`1//36 pi` cm/min

`1//8pi` cm/min

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