Diameter and altitude of a right circula...

Diameter and altitude of a right circular cylinder are 20 cm and 30 cm respectively .If the diameter is increasing at the rate of `4 cm//sec`., then the rate of change in its altitude when the volume is constant is

`8 cm//sec`.

`12 cm //sec`.

`-6 cm //sec`.

`-12 cm //sec`

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