If Jackie were to paint her living room alone, it would take seven hours. Her sister Rachel could do the job in nine hours. How many hours would it take them working together?

Three baby penguins and their father were sitting on an iceberg 0.50.50, point, 5 meters above the surface of the water. the father dove down 4.74.74, point, 7 meters from the iceberg into the water to catch dinner for his kids. what is the father penguin's position relative to the surface of the water?