Geographic Grid: Latitudes and Longitudes — Geography STD 9 — Question

The Great Circle Routes follow the great circles i. e. the perimeters of the earth, which cover the shortest distances between any two places in spite of the zigzag routes along the surface of the earth. These circles are beneficial for following the shortest distances between any two places and help in saving the time.
i. e. the shortest routes are covered in the minimum time span.