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Black Book Advanced Problems in MathematicsMathematicsApplication of Derivatives

A spherical iron ball 10 cm in radius is coated with a layer of ice of uniform thickness that melts at a rate of 50 cm ^3/ min . When the thickness of ice is 5 cm , then the rate at which the thickness of ice decreases, is :

Options

  1. A1 36 cm/min
  2. B1 18 cm/min
  3. C1 54 cm/min
  4. D5 6 cm/min

Correct answer

B. 1 18 cm/min

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