Volume of lower cylinder = π * r^2 * 2h = 2πr^2h Volume of upper cylinder = π * (2r)^2 * h = 4πr^2h Volume of container = 2πr^2h + 4πr^2h = 6πr^2h It took 18 minutes to fill the container of volume 6πr^2h, the it will take 2 * 18 / 6 = 6 minutes to fill the lower container of 2πr^2h. Answer: 6 minutes
