1.

An iron ball having 10 cm radius is covered equally with Ice. Ice is melted at the rate of 50 cm^(3)/min. when the thickness of ice is 5 cm, rate of decrease in radius is ………….. cm/min.

Answer»

`(1)/(36 pi)`
`(1)/(18pi)`
`(1)/(54 pi)`
`(5)/(6PI)`

Answer :B


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