Since the longitude is the same (75W), the distance can be calculated as the difference between the latitudes. One degree = 60 nautical miles. From 20N to 30S is 50 degrees, so 50 * 60 = 3000 nautical miles.
150
25
150
The GCF is 1.
3
The GCF is 3.
1575
It is: 3
225
The GCF is 75
It is 15
The GCF is 3.