Question

An aeroplane flies from town A(20°N,60°E) to town B(20°N,20°E) if the journey takes 6hours, calculate, correct to 3 significant figure, the average speed of the aeroplane.
Change in longitude =60-20=40°=40π/180
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Distance travel from A to be C in the arc=(40π/180)6400)cos(lat)

Where the latitude is the same 20°

Average speed=(total distance)/total time

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