JEE Math Practice Question
A spherical iron ball of 10 cm radius is coated with a layer of ice of uniform thickness the melts at a rate of 50 cm3/min. When the thickness of ice is 5 cm, then the rate (in cm/min.) at which of the thickness of ice decreases, is :
- A.$${1 \over {18\pi }}$$
- B.$${1 \over {36\pi }}$$
- C.$${1 \over {54\pi }}$$
- D.$${5 \over {6\pi }}$$
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