An aeroplane leaves a point on latitude 54degree south at 10 a.m. It flies due south at a steady speed of 800km/h.

Question

(a) what is its latitude at mid-point?
(b) at what time does it pass over the south pole?

Answer 1

circumference of earth is roughly 40000km
latitude 54 south is 36 degrees from pole.
36/360 * 40000 = 4000 km

4000/800 = 5 hours to the pole.