Uh yeah just answer the question on the pic :)

Answer:
52 km.
Step-by-step explanation:
[tex]a^{2} + b^{2} = c^{2}[/tex]
[tex]165^{2} + x^{2} = 173^{2}[/tex]
[tex]27225 + x^{2} = 29929[/tex]
[tex]x^{2} = 2704[/tex]
[tex]x = \sqrt{2704}[/tex]
[tex]x = 52[/tex]