Extracted text: A compound piping system consists of 1800m of 50 cm diameter, 1200 m of 40 cm diameter and 600 m of 30 cm diameter pipes of the same material (same value of f) connected in series. What is the equivalent length of a 40 cm pipe of the same material? Do not write the unit. You will only input the numerical answer in the space provided. Unit of the Correct Answer: m Decimal Places required in the final answer: 3