A round pipe of varying diameter carries petroleum from a wellhead to a refinery. At the wellhead the pipe\'s diameter is 59.7 cm (0.597 m) and the flow speed of the petroleum is 10.7 m/s. At the refinery the petroleum flows at 5.93 m/s. What is the volume flow rate of the petroleum along the pipe and what is the pipe\'s diameter at the refinery?