2. (12) A bird, released from an island that is 5 km from the nearest point A on a straight shoreline, flies to a point B on the shoreline, and then flies along the shoreline (over land) to a point C 13 km from point A (point B is between A and C) . If it takes 1.4 times as much energy to fly over water as it does over land, to what point B should the bird fly in order to minimize the total energy consumption in flying from the island to point C? Give exact answer simplified. 2