Answer
See below.
Work Step by Step
Home $\rightarrow$ Post Office: 3 miles.
Post Office $\rightarrow$ Dry Cleaners is 5 miles.
Dry Cleaners$\rightarrow$ Bank is 3.5 miles.
Bank $\rightarrow$ Home is 1 mile.
This makes a total of 3+3+3.5+1=12.5 miles.
