$60,000l\frac{b}{h}r$ of a $25\%$NaCl solution is cooled from $150$ to $100F$ using water with an inlet temperature of $80F.$ What outlet water temperature may be used? Available for the service is a $\frac{211}{4}in.$ ID $1-2$ exchanger having $302$ tube $\frac{3}{4}$ in$.$ OD$.14$ BWG$,16\text{'}0\text{'}"$ long. Baffle are spaced $5in.$ apart. and the bundle is arranged for two passes. What are pressure drops and fouling factor?