Answer:
11.18 miles
Explanation:
We see a right triangle here
and a² + b² = c² shows the relationship between all sides of the triangle
c is the hypotenuse and also the distance between the planes.
Let's plug in the values 5 and 10 in the equation to find c
(5)² + (10)² = c²
Solve!
25 + 100 = c²
125 = c²
find the square root of 125
√125 = √c²
c ≈ 11.18 miles