1.

A sperical ball of salt is dissolving in water in such a manner that the rate of decrease of its volume at any instant is equal four times its surface area. The rate of decrease in its radius (in units/sec) will be

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A sperical ball of salt is dissolving in water in such a manner that the rate of decrease of its volume at any instant is equal four times its surface area. The rate of decrease in its radius (in units/sec) will be



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