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At a certain instant, diameter and altit...

At a certain instant, diameter and altitude of a cylinder are 20 cm and 40 cm respectively. If diameter is increasing at the rate of `2cm //sec`, then the rate of change in altitude to keep the volume constant is

A

`8 cm//sec`.

B

`-8 cm//sec`.

C

`6 cm //sec`.

D

` 10 cm//sec`.

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The correct Answer is:
B
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