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If the two ratios $ 2b:\cfrac{5a}{3} $ and $ 3a:\cfrac{4}{5b} $ are equivalent, what is the value of $a$?

$ \cfrac{1}{\sqrt{5}} $

$ \cfrac{2\sqrt{2}}{5} $

$ \cfrac{2}{\sqrt{5}} $

$ \cfrac{2}{5\sqrt{3}} $

$ \cfrac{2\sqrt{6}}{5} $