Question 189Navigation General

The correct answer is B) 41°15' and 41°45'. On a Mercator chart, the distance between two points along the same meridian (longitude line) is proportional to the difference in their latitudes. Since the question asks to measure the distance between two points with a 2-degree difference in latitude (42°30'N and 40°30'N), the divider points should be set to a 1-degree difference in latitude (41°15' and 41°45') to measure 30 miles at a time. The other options are incorrect because they do not represent a 1-degree difference in latitude. Option A and D are too close to the original latitudes, while option C is too far apart.