Bar $BE$ of the pin$-$connected system is made of an aluminum alloy with an elastic

modulus $E_{BE}=70$GPa, a cross$-$sectional area $A_{BE}=300m{m}^2,$ and a coefficient of

thermal expansion ${}_{BE}=22\mathrm{.}5\frac{{10}^{-6}}{}C.$ Bar $AD$ is made of a hardened carbon steel with

an elastic modulus $E_{AD}=210$GPa, cross$-$sectional area $A_{AD}=1200m{m}^2,$ and a

coefficient of thermal expansion ${}_{AD}=11\mathrm{.}9\frac{{10}^{-6}}{}C.$ Bar CDE is rigid. The temperature

of the system was originally $40C$ but has decreased to $15C.$ Please determine the

displacement at point $E.$