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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 `50cm^3//min`. When the thickness of ice is 5 cm, then the rate at which the thickness of ice decreases is

A

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

B

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

C

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

D

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

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The correct Answer is:
B
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