Question 958229
along the ground, the distance to points below each plane is 70 + 20 , or 90 miles.
Since one plane is 2 miles high and the other is 8 miles high, the distance between the planes is the hypotenuse of a triangle with height of 6 miles
and a base of 90 miles.
If c is the distance between the planes,
{{{c^2 = 90^2 + 6^2}}}
{{{c^2 = 8100 + 36}}}
{{{c = sqrt(8136)}}}
c = 90.199 miles