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.

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

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

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

`(5)/(6pi) cm//min`

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