Assignment:
A rescue Helicopter at an altitude of 200 m spots two lost girls at the same time. Xavia is at an angle of depression of 13 degree. Yelena is at an angle of depression of 13 degree. From a point on the ground directly below (B) the Helicopter, Yelena is at an angle bearing of 120 degree, Xavia is at a bearing of 240 degree. How far apart are the two girls?
Provide complete and step by step solution for the question and show calculations and use formulas.