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Application of Derivatives question

2019 · 10 Apr · Shift 2 · Q24
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  5. /2019 · 10 Apr · Shift 2 · Q24

Application of Derivatives question

2019 · 10 Apr · Shift 2 · Q24

JEE MainMathematicsApplication of DerivativesMCQ+4 / −1
A spherical iron ball of radius 10 cm is coated with a layer of ice of uniform thickness that melts at a rate of 50 cm3 /min. When the thickness of the ice is 5 cm, then the rate at which the thickness (in cm/min) of the ice decreases, is :
  1. A
    56π{5 \over {6\pi }}6π5​
  2. B
    19π{1 \over {9\pi }}9π1​
  3. C
    136π{1 \over {36\pi }}36π1​
  4. D
    118π{1 \over {18\pi }}18π1​
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