a round pipe of varying diameter carries petroleum from a wellhead to a refinery. at the wellhead, the pipe's diameter is 55.7 cm and the flow speed of the petroleum is 10.3 m/s. at the refinery, the petroleum flows at 5.35 m/s. what is the volume flow rate of the petroleum along the pipe, and what is the pipe's diameter at the refinery? volume flow rate: m3/s diameter: