18. Calculate the altitude of the eagle

An eagle is flying at a speed of 130 \(km/h\). If the angle of elevation of an eagle from a point on the ground is 45\(^{\circ}\). After 13 seconds, the angle of elevation changes to 30\(^{\circ}\), then the altitude of the eagle from the ground is -0.2910.7091.7092.709 \(km\). (Use \(\frac{1}{\sqrt{3}} = 0.577\))