Chapter 1.1, Problem 61E

To determine

To calculate: The distance between the cities given below, if Earth is considered to be a sphere of radius $4000\text{ miles}$ and that the cities are on the same longitude (one city is due north to other).

$\begin{array}{l}CityLatitude\\ \text{City D 32}°\text{4<msup>7<mo>′</mo></msup><msup><msup>9<mo>′</mo></msup><mo>′</mo></msup> N }\\ \text{City O 41}°\text{1<msup>5<mo>′</mo></msup>5<msup><msup>0<mo>′</mo></msup><mo>′</mo></msup> N}\end{array}$