To answer this question, you must first know the Pythagorean theorem c^2= a^2 + b^2 The c will always be your hypotenuse and the legs are a and b c^2=68^2 + 80^2 c^2= 4,624 + 6,400 c^2= 11,024 Now square root both sides answer is 105 mi (104.995 if you want it to be exact)