Question 162357
you managed to "stumble" onto the correct answer


you defined Z as the rate __ "PIPE B RATE = Z"
__ but then used 1/Z in your calculations


"T*R = w"
"T(1/12) + T-4.5(1/Z)=1"
"9(1/12) + 9-4.5(1/Z)=1"