An aeroplane has an airspeed (speed relative to air) of 250kmh−1. The wind blows from west to east at 50kmh−1. At what angle (to the nearest tenth of a degree) west of north should the pilot steer so that the aeroplane moves due north relative to the ground?
a) 14.0∘
b) 11.5∘
c) 78∘
d) 22∘