Step-by-step explanation:

by taking L.C.M








1/3 divided by 1/6 = 2
2 miles per day
This looks like: 
To solve this problem, you'll want to use the AC method to factor x^2+7x-30.
After factoring your expression will look like this:

Cancel out the x+10 because they are common factors, so you are just left with the simple x-3.
Answer is:
x - 3