Need detailed solution. 4 decimal places. Oil with a specific gravity of 0.82 is flowing in a pipe under the condition below. If the total head loss from point 1 to point 2 is 3 ft, find the pressure at point 2 in psi. *cfs = cubic ft per sec

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Water is flowing in a 2 inch Schedule 40 steel pipe with a volume flow rate of 1.0 gpm. Compute the pressure difference between two points 500 feet apart.  The pipe is horizontal.  Report your result in WC.

This is a practice problem for an upcoming test, but I'm not really sure which direction to solve it in. If I use a basic pressure equation do I have to do iterations? Cause we should be able to take a ratio of flow in both pipes. Any information on the direction of how to solve this problem will be extremely helpful, as well as solving it.