. An aeroplane which flies at 100 km/hr in still air is flying on a day on which the wind is blowing from the South at 40 km/hr

(a) Find the time taken to fly north for a distance of 70 km.
(b) i) Find the direction which the pilot must set his plane in order to fly due east.
ii) Find the ground speed, to the nearest km/hr, and the time taken to fly due east a                    distance of 276 km.