Accurate solution of Prob. 6.143, using Fig. 6.41, requires iteration because both the ordinate and the abscissa

Question:

Accurate solution of Prob. 6.143, using Fig. 6.41, requires iteration because both the ordinate and the abscissa of this figure contain the unknown flow rate Q. In the spirit of Example 5.8, rescale the variables and construct a new plot in which Q may be read directly from the ordinate. Solve Prob. 6.143 with your new chart.