Question 709606
Use Pythagorean theorem:
{{{c^2 = a^2 + b^2}}}

{{{c^2= 120^2 + 170^2}}}
{{{c^2= 14400 + 28900}}}
{{{c^2= 43300}}}
{{{c= sqrt(43300)}}}
c=208.0865

Answer: 208.0865km