Answer:
they will be 60 kilometers apart.
Explanation:
well you use pythagorean theorem
12 × 3
=36
16 × 3
=48
pythagorean theorem states that:
a²+b²=c²
so
48² + 36² =3600
then, because c is squared, you just square root it
√3600 = 60
I drew a diagram to help explain, it's a bit crude but it works