The distance between the 3rd lamppost and 8 th lamppost is 100 meters.
Step-by-step explanation:
If the distance between 2 lampposts is 40 meters, you would divide the neters by 2. This would give you the answer of 20, meaning the distance between lampposts is 20 meters. So multiply 20 * 5 to get the distance between the third lampost and eight lamppost.