A pitch of 1/4-in. per foot must be maintained on a drain pipe that is being hung under floor joists. On the upstream end of the pipe, it measures 141/2-in. from the underside of the floor above to the centerline of the pipe. What will the measurement be from the underside of the floor to the centerline of the pipe 20 ft. downstream?

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A pitch of 1/4-in. per foot must be maintained on a drain pipe that is being hung under floor joists. On the upstream end of the pipe, it measures 141/2-in. from the underside of the floor above to the centerline of the pipe. What will the measurement be from the underside of the floor to the centerline of the pipe 20 ft. downstream?