ABSTRACT
Teacher: “In the diagram a kingfisher is at A, 60 m above the ground in a tree beside a stream. The stream is teeming with fish, and the kingfisher can go anywhere between G and H to get a fish and then fly up to its nest at B, 90 m above the ground. The distance GH is 200 m. At what point P on GH should the kingfisher catch a fish so as to make its total flight distance AP + PB be as short as possible? Try this first just by calculation.”
