Two cars start off at the same point on a straight highway f

Two cars start off at the same point on a straight highway facing opposite
directions. Each car drives for 6 miles, takes a left turn, & drives for
8 miles. How far apart are the two cars ?

Solution

Now I knwo that this question is from the \"IQ\" test, anyway i will still solve it:
:
think of two right triangles with sides 6-8-x , x is the longest side and so it is equal to 6^2+8^2 = 36+64 = 100 and then square root it, so it is 10
and we have two, so it is 20