$(3)$ Crime analysis: There are a bunch of hobos wreaking havoc along the

railroads, and the police want to know how much railroad is within $10$

miles of key points. You are the person for the job. Pretend there are a

ton of different point shapefiles in the Challenge$\_3$ folder. List the point

shapefiles using the List Feature Classes function $(2$ pts$).$ Loop over the

list of shapefiles $(2$ pts$),$ and save all output to the Results folder. Inside

the loop complete the following tasks $(1$ pt for each task$)$:

Create a $10-$mile buffer around the point shapefile.

Clip railroads, shp using the buffer.

Dissolve the railroad clip into a single feature.

Add a float field to the dissolved shapefile.

Calculate the mileage of the dissolved shapefile.

Your end result should be the length of railroad within $10$ miles of the key

points. This is the area that the police must patrol. Report how much

railroad the police must patrol below $($this includes the mileage in

each shapefile$)(1$ pt$).$

Miles of railroad $=$