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.

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!