Part A: The Fun-For-All Amusement Park has just been built and is getting ready to open in just one month! The inspector just visited yesterday, and everything looks good, except for one thing â€" the park has no ramps for wheelchair access. You need to help create these ramps. The required rate for a ramp is a maximum of 1 inch of rise for every 12 inches of length traveled.

The first ramp needs to grant access to the restrooms. The restroom door is 18 inches off of the ground.

How far away does the ramp need to start in order to meet the required rate?