You can put this solution on YOUR website! A right triangle is formed with legs of 48 and 64.
The distance from the starting point will be the length of the hypotenuse.
a² + b² = c² {the Pythagorean Theorem}
48² + 64² = c² {substituted given information into Pythagorean Theorem}
2304 + 4096 = c² {evaluated exponents}
6400 = c² {added}
c = 80