What are the known quantities in the problem? What is the unknown quantity we are asked to find?
Which trigonometric function relates height and horizontal distance? If x is the horizontal distance of the aircraft from Radar A, how can the height be expressed using the tangent function?
How can the distance of the aircraft from Radar B be expressed in terms of x? What equation do we get if we set the two height expressions equal?
How do we find the distances from both radar stations after finding x? Which trigonometric function do we use to find the actual (slanted) distance, not just the horizontal one?