Hello!
As we can see, one inch=30 miles. The easiest way to do this would be to multiply 5.6 by 30.
5.6(30)=168
Just to check, we can write this a proportion and solve.
[tex] \frac{inches}{miles} = \frac{1}{30} = \frac{5.6}{m} [/tex]
We cross multiply below and divide by one.
5.6(30)=168/1=168
Therefore, the correct answer is B)168 miles.
I hope this helps!