Question 932678
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..., and base radus 2 times shorter than first cylynder parameters. ...
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WHAT?  Meaningless!


That is just bad.  Maybe you or the material is trying to say,
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Second cylinder height is an additional three of the first's length, and one half the radius of the first's 
cylinder.  Calculate the volume of the second cylinder.
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First cylinder, {{{h*pi*r^2=12}}}


Second cylinder, {{{(h+3h)pi*(r/2)^2=v}}}

{{{4h*pi*r^2(1/4)=v}}}

{{{(4/4)h*pi*r^2=v}}}

{{{h*pi*r^2=v}}}--------------but this is the same as left side equation of the First cylinder; so BOTH cylinders are still 12 cubic meters.