please read carefully this is slightly differnt than the chegg solutions already posted. thank you(:

A horizontal pipeline 20 miles long delivers petroleum at a certain flow rate (Q0) with a drop in pressure of 3000kPa across the line. Now you will consider three possible changes to the last 10 miles of the pipeline. Please determine which leads to the greatest increase in volumetric flow rate. The drop in pressure over the entire 20 miles remains fixed at 3000kPa, and you may neglect the effect of the change in the pipeline at the interface between the segments. Assume the flow is laminar. 1) Double the last 10 miles of pipe with an identical pipe (two pipes in parallel). 2) Replace the last 10 miles of the pipe with a pipe that has twice the diameter of the original. 3) Replace the last 10 miles of pipe with a pipe that has twice the cross-sectional area of the original