$a)\frac{2}{{\sout{3}}^1}\cdot {\sout{30}}^{10}=20\text{zł}$

$b)\frac{3}{{\sout{4}}^1}\cdot {\sout{8}}^2=6\text{kg}$ $b)\frac{3}{{\sout{4}}^1}\cdot {\sout{8}}^2=6\text{kg}$

$c)\frac{5}{{\sout{4}}^1}\cdot {\sout{12}}^3=15\text{h}$

$d)\frac{3}{{\sout{5}}^1}\cdot {\sout{60}}^{12}=36\text{zł}$

$e)2\frac{3}{5}\cdot 5=\frac{13}{{\sout{5}}^1}\cdot {\sout{5}}^1=13\text{kg}$

$f)1\frac{1}{2}\cdot 30=\frac{3}{{\sout{2}}^1}\cdot {\sout{30}}^{15}=45\text{h}$