The altitude of a cone is 20 cm and its ...

The altitude of a cone is 20 cm and its semi-vertical angle is `30^@.` If the semi-vertical angle is increasing at the rate of `2^@` per second, then the radius of the base is increasing at the rate of

A

30 cm/sec

B

`(160)/(3)` cm/sec

C

10 cm/sec

D

160 cm/sec

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The correct Answer is:

B

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