If a rectangle is twice as long as it is wide and has a perimeter of 6 inches, what is the area of the rectangle?

- \\(\\sqrt{3}\\), \\(-\\frac{1}{3}\\), 0, 1, \\(\\frac{7}{4}\\), 9.7, ... are:

15 liters of water are poured into an aquarium that`s 70cm long, 30cm wide, and 40cm high. How many cm will the water level in the aquarium rise due to this added water?

(1 liter = 1,000cm³)