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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 m3/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.

A

`1 m// min`.

B

`1.5m //min`.

C

`2m//min`.

D

`2.25 m//min`.

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