Answer:
sqrt(170) or 13.038 km
Explanation:
We can use the Pythagorean theorem to solve
a^2 +b^2 = c^2
where a and b are the legs and we are looking for the hypotenuse
7^2 + 11^2 = c^2
49+121 = c^2
170 = c^2
Take the square root of each side
sqrt(170) = c
13.03840481