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Air at 85 °F flows isothermally through a 6 in diameter smooth pipe at a flow...

Air at 85 °F flows isothermally through a 6 in diameter smooth pipe at a flow rate of 10 lbm/s.  If the pressure at one section is 70 psia, determine the pressure at a section 600 ft downstream from the first section.  Give your final answer in psia. Answer should be 59.7 psia

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