If you follow your neighbor at a distance of four seconds, how much later will you arrive at work compared to them?

Following your neighbor at a distance of four seconds means that you are maintaining a gap that takes an additional four seconds to traverse compared to them. This time gap translates directly to how much later you will arrive at your destination, assuming both of you are traveling at the same speed. Therefore, if you are positioned four seconds behind, it will take you four seconds longer to reach your work compared to your neighbor. This is why the answer correctly indicates that you will arrive four seconds later.