(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

v=1/3 pi r^2 h

dv/dt = 1/3 pi (2rh dr/dt + r^2 dh/dt)

now i sub r=15/3 and h=3 .

Now i express dr/dt=dr/dh x dh/dt

and find dr/dh .

But it fails

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