Since jason is currently at 54 feet above sea level and David is 11 feet below sea level the add 11 plus 54 which would give you 65 feet is there distance of elevations
20 inches... the area of the small window is 20^2 which is equal to 400. Therefore the bigger window is 25 inches long and the area of the bigger window is 625 inches^2. Add these areas together to get 1025 in^2