Answer:
[tex]37.5\times 10^6\ inches\ or\ 591.85606\ mi[/tex]
Explanation:
[tex]d_s[/tex] = Diameter of the solar system
[tex]d_m[/tex] = Diameter of the Milky way = [tex]25\times 10^6\times d_s[/tex]
Here [tex]d_s=1.5\ inches[/tex]
Diameter of the Milky way would be
[tex]d_m=25\times 10^6\times 1.5\\\Rightarrow d_m=37.5\times 10^6\ inches[/tex]
The size of the disk which represents the galaxy is
[tex]37.5\times 10^6\ inches=\frac{37.5\times 10^6}{63360}=591.85606\ mi[/tex]
