Drawings to an old buried pipeline have been lost. At the entrance and exit of the pipe,

Question:

Drawings to an old buried pipeline have been lost. At the entrance and exit of the pipe, two pressure gauges measure a pressure drop of 16.3 psi (lb/in.2). If the 6-in. galvanized iron pipe carries water at 68°F with a flow rate of 1.34 cfs (ft3/sec),/what is the length of the horizontal under-ground line? Ignore minor losses.