Iron ball of radius 10 cm coated with ice melting at 50 cubic cm/min: rate the ice thickness falls

1. A.
   $\frac{-1}{18\pi}$ cm/min
2. B.
   $\frac{2}{9\pi}$ cm/min
3. C.
   $\frac{1}{18\pi}$ cm/min
4. D.
   $\frac{1}{3\pi}$ cm/min

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1. A.
   $\dfrac{1}{18\pi}$ cm/min
2. B.
   $\dfrac{1}{36\pi}$ cm/min
3. C.
   $\dfrac{5}{6\pi}$ cm/min
4. D.
   $\dfrac{1}{54\pi}$ cm/min

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