examday

/TMUA

A drone is at a point $T$ vertically above a point $O$ on horizontal ground. Points $A$ and $B$ lie on a straight line on the ground, with $A$ between $O$ and $B$.

The angles of elevation of $T$ from $A$ and $B$ are $60^\circ$ and $30^\circ$, respectively, and $AB=20\,\mathrm{m}$.

What is the height $OT$?