2/3 of a cup of batter can make 5/6 of a batch of pancakes. How many cups of batter are needed to make one batch of pancakes?

Adolphin is swimming with her friend. the dolphin jumps to a height of 4.54.54, point, 5 meters above the surface of the water as her friend swims 9.89.89, point, 8 meters directly below her. what is the position of the dolphin's friend relative to the surface of the water? meters