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:

\(\frac{1}{{36{\rm{\;}}\pi }}\)

A spherical iron ball of radius 10 cm is coated with a layer of ice of

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:
A.	\(\frac{1}{{18\;\pi }}\)
B.	\(\frac{1}{{36{\rm{\;}}\pi }}\)
C.	\(\frac{5}{{6{\rm{\;}}\pi }}\)
D.	\(\frac{1}{{9{\rm{\;}}\pi }}\)
Answer» B. \(\frac{1}{{36{\rm{\;}}\pi }}\)

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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:

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