Chemical Kinetics

What is the rate of disappearance of B in following reaction? \(2 \mathrm{A}+\mathrm{B} \rightarrow 3 \mathrm{C}\), if rate of appearance of \(\mathrm{C}\) is \(1.3 \times 10^{-4} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\).