11. Determine the distance between the two ships

A person in a helicopter flying at the height of 611 \(m\) above sea level observes two ships lying opposite to each other on the sea. The angles of depression of the ships are 30\(^{\circ}\) and 45\(^{\circ}\). Then, the distance between the two ships is 1667.2521670.2521669.2521668.252 \(m\).

 

 

(Note: Substitute \(\sqrt{3} = 1.732\) if necessary.)