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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.