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Question

A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness than melts at a rate of 50 cm3/min. When the thickness of ice is 5 cm, then the rate at which the thickness of ice decreases, is

Options

A. cm/min
B. cm/min
C. cm/min
D. cm/min

Solution

= 50
4πr2 = 50
⇒   where r = 15

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