The positions of towns X and Y are given to the nearest degree as X(40°N, 124°E) and Y(40°N,56°W)

- Longitude difference
- Find the distance in nautical miles between x and y along a parallel of a latitude.
- Find the distance XY via the north pole in nautical mile.
- A plane flying at 200 knots leaves y at 2.00p.m. on Monday what time and day does it arrive at x via great circle.