The two wires A and B of equal cross-section but of different materials are joined together. The ratio of Young's modulus of wire A and wire B is…

The two wires $\displaystyle A$ and $\displaystyle B$ of equal cross-section but of different materials are joined together. The ratio of Young's modulus of wire $\displaystyle A$ and wire $\displaystyle B$ is $\displaystyle 20$/11. When the joined wire is kept under certain tension the elongations in the wires $\displaystyle A$ and $\displaystyle B$ are equal. If the length of wire $\displaystyle A$ is $\displaystyle 2.2$ m , then the length of wire $\displaystyle B$ is $\displaystyle \_\_\_\_$ m.