A saturated solution of AgA  $(K_{sp}=3\times {10}^{-14}{M}^2)$  and AgB  $(K_{sp}=1\times {10}^{-14}{M}^2)$  has conductivity of  $375\times {10}^{-10}oh{m}^{-1}.c{m}^{-1}.$  The limiting molar conductance of 
$A{g}^{+},A^{-}$ are  $60oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ , $80oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ , then what is the limiting molar conductance of $B^{-}$ is  $\left(oh{m}^{-1}c{m}^{2}mo{l}^{-1}\right)$