Finding Midpoints on Geographical Maps

In standard math class we have startted a new Unit. We started with finding midpoints on geographical maps. First we had to chose two places from anywhere from the World. I selected the city Osijek, which is located in northern Croatia under the points 45.550 as latitude and 18.697 which        is the longitdude. We learned that the longitude lines represent the X axis, while the latitude lines represent the Y axis. My second place was Crna Bara, a small village in Vojvodina, in the Banat region, which is northern Serbia. Its coordinates were latitude as 45.966, and longitude 20.281