ANSWER:
The scale factor is 11/48
STEP-BY-STEP EXPLANATION:
The scale factor is the quotient of the values between what is real and what is drawn.
But we must have the same units of measurements, therefore we will change the feet to inches, knowing that 12 inches is a foot, in the following way:
[tex]\begin{gathered} 60\text{ ft}\cdot\frac{12\text{ in}}{1\text{ ft}}=720\text{ in} \\ \text{therefore, the scale factor is:} \\ f=\frac{165}{720}=\frac{11}{48} \end{gathered}[/tex]