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A cylindrical vessel of radius 0.5 m is ...

A cylindrical vessel of radius 0.5 m is filled with oil at the rate of 0.25`pi``m^3``/`minute. The rate at which the surface of the oil is rising, is (a) 1 m/min.    (b) 2 m/min.   (c) 5 m/min.   (d) 1.25 m/min.

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