S.93 T.258

$AB-CB\ \left(x\right)$
$CB-DB\left(y\right)$

$DB-DE\left(z\right)$

$\frac{750}{\sin71{,}5}=\frac{x}{\sin57{,}5}$
$\sin71{,}5x=379{,}526...$
$x=667{,}0123...$
$\left(CB\right)$
$\frac{667{,}0123...}{\sin82{,}6}=\frac{y}{\sin50{,}9}$
$\sin82{,}6y=567.632...$
$y=521{,}980...$
$\left(DB\right)$
$\frac{521{,}980...}{\sin32}=\frac{z}{\sin35{,}4}$
$\sin32=302{,}373$
$z=570{,}602...\approx570m$
$V:DE\approx570m$