working with the velocity components of the air vector, wind vector, and ground vector ...
$\displaystyle A_x + W_x = G_x$
$\displaystyle 480\cos(15) + W_x = 500$
$\displaystyle A_y + W_y = G_y$
$\displaystyle 480\sin(15) + W_y = 0$
solve for the two components of wind ... then you can find the wind speed and direction
wind speed = $\displaystyle \sqrt{W_x^2 + W_y^2}$
direction relative to east = $\displaystyle \arctan\left(\frac{W_y}{W_x}\right)$