An Airplane lives a point on latitude 54°S at 10am. It flies due south at a steady speed 800km
(a) what is its latitude at midday (12)
(b) At what time does it pass over a South pole
how many miles in one degree of latitude? Say it's x
So the plane flies 800/x degrees per hour
(a) 54 + 2 * 800/x
(b) it will take 36x/800 hours to get to the pole