The value of K_sp at CaCO₃ and CaC₂O₄ are 3.6 x 10^-9 and 1.2 x 10^-9 respectively at 25^oC. If the mixture of these two is washed with water, the concentration at Ca⁺² ions in water is $x \times {10}^{-5}M.$Find the value of 'X'?  $(\sqrt{3 }=1.7)$ (Round off the answer to one decimal place)