water seeps out of a inverted conical filter at the constant rate of 5cc/s.The height of the filter is 20 cm and base radius is 10cm. Find the rate at which the height of the water level decreases at the moment when the water level is 15cm.

Hi Abdullah!
Here is the answer to your query.
 
The given information can be represented diagrammatically as,
 
 
Hope! This will help you.
Cheers!!!

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