What is the approximate distance between Portland, Oregon (45° north, 122° west), and San Francisco, California (37° north, 122° west). Use 3,960 miles for the radius of Earth.

258 miles

553 miles

720 miles

1,346 miles

From the given data in the problem, the longitude is essentially the same, and using the coordinates, the locations are 8° apart. The 8° is 8/360 of the circumference of the circle. The circumference is 2π • 3960. Substituting, (8 • 2π • 3960) / 360 = 4π • 44 = 553 miles. Thus, option B is the answer.