UPSKILL MATH PLUS

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A person in the helicopter flying at the height of 670 \(m\) above the river, observes two objects lying opposite to each other on either bank of a river. The angles of depression of the objects are 45\(^{\circ}\) and 30\(^{\circ}\). Then, the width of the river is  \(m\).
 
(Note: Substitute \(\sqrt{3} = 1.732\) if necessary.)