A square chessboard is made up of 64 white and black squares arranged in 8 rows and 8 columns. The side length of each square is 2 inches. What is the perimeter of the chessboard?

Step 1: Dalton travels 5 km south and then 2 km west, forming a right triangle with legs of 5 km and 2 km.

Step 2: The straight-line distance $d$ from the starting point is the hypotenuse of the right triangle.

Formula:
$d = \sqrt{(5\ \rm km)^2 + (2\ \rm km)^2}$

Step 3: Substitute the values.
$d = \sqrt{25\ \rm km^2 + 4\ \rm km^2}$

Step 4: Simplify inside the square root.
$d = \sqrt{29\ \rm km^2}$

Step 5: Take the square root.
$d = \sqrt{29}\ \rm km \approx 5.39\ \rm km$

Final answer: $\sqrt{29}$ km
\sqrt{29 km}