an aeroplane flies from kubwa(lat 15 ,long 18w) to another town ,bako at the same latitude for 8hrs at long 23E .it then changed course and travelled for a distance 4785km due south of bako to kanji at kanji on the same latitude, travelled for 5hrs at a speed of 6427km/hr due west of kanji and stopped at donkwa ?
??? indeed. Is there a question in there somewhere?
Just recall that if the earth's radius is R, then the radius of the circle at latitude x degrees North is R cos(x).
That will enable you to answer the question (whatever it turns out to be) given the coordinates above.