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Lesson on calculating speed

Answer Text:
Lesson on calculating speed:
-A speed of 1 nautical mile per hour is called a knot. This unit of speed is used by airmen and sailors.

Example:
A ship leaves Mombasa (#4^o S,39^0E#)and sails due east for 98 hours to appoint K Mombasa (#4^0S,80^0#E) in the Indian Ocean.
Calculate its average speed in;
a).Km/h
b).Knots