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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.

A

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

B

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

C

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

D

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

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The correct Answer is:
B
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