$(8$ pts$.)$ A $40$ psi water line is routed $25$ ft up to a $3$ rd floor location. Find:

a$.$ The psi loss in water being pumped up $25$ ft $.$

b$.$ The final $($resulting$)$ pressure in the water line at the $3$rd floor location.

$(10$ pts$.)$ A $4"$ x $6"$ inch rectangular duct is used to supply air to a space at a rate of $450$ CFM$.$ Determine $($a$)$ the air velocity through the duct, $($b$)$ the exit pressure.

Show work for all problems.