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Revision exercise on longitudes and latitudes

Answer Text:
Revision exercise on longitudes and latitudes:
1. Two places X and Y are 960 km apart and X is due south of Y. If the latitude of X is `40^0N`, find the latitude of Y.
2. Calculate the distance between the points P `(40^0N, 15^0W)` and Q `(40^0N, 60^0 W)` in:
a).Km.
b).nm.
3. A ship sails 450nm due East from a point T `(40^0N, 60^0 E)`. Find the new longitude.