The distance, d, in kilometres, that a person can see across the ocean to the horizon is given by the formula d = square root of 12.74 x h. In the formula h is the height, in metres, of the person's eyes above the water. Calculate the distance that each of the following people can see across the horizon. Express each answer to the nearest tenth of a kilometre.
c) Yvonne is the pilot of an aircraft flying 5 km above the coastline.
252.4 km is the distance that Yvonne can see across the horizon.