At 6 am, a ship is sailing due south at constant speed. The navigator sights a lighthouse of bearing 270° at a distance of 24.2 km. At 6:30 am
the bearing of the lighthouse is 285. Find to the nearest km/hour the rate at which the ship is sailing.
km/hr (Round to the
nearest whole number). If the ship keeps sailing south at a constant rate find the bearing of the light house at 9am.