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

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

`5/(6pi) cm/min`

`1/(54 pi) "cm/min"`

`1/(18pi) "cm/min"`

`(1)/(36) "cm/min"`

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