Answer:
The two planes are 230 miles away after one hour.
Explanation:
We know the speed of airplanes A and B and we know the angle between the speeds of both.
If the speed of plane A is 200 miles per hour, and the speed of plane B is 300 miles per hour, then after 1 hour the plane A will have traveled 200 miles and the plane B will have traveled 300 miles.
If we call c the distance between the two planes then we can use a triangle of sides, a, b and c
Where

c = distance between both planes
Side c is opposite the angle of 50 °.
Then we use the law of cosine to find c.




