A pin connected plane structure is subjected to a load of $P=45kN$ at point $B($see the figure

below$).$ If:

$A_1=0\mathrm{.}0055m^2$

$L_1=1\mathrm{.}5m$

$E_s=70$GPa

$A_2=0\mathrm{.}0035m^2$

$L_2=2\mathrm{.}5m$

$E_2=200$GPa

Determine the deflection at point $B.$