Help me to understand how to go about solving these problems. Preferably a step by step how to. Thank you! (The sooner, the better)

Consider the office layout shown below and the accompanying trip and distance matrices. Determine the total distance traveled per day. Do not round intermediate calculations, Round your answer to the nearest whole number. meters Determine the layout that results in a lower total distance traveled per day. Do not round intermediate calculations. Round your answer to the nearest whole number. If you switch departments the total distance traveled per day will lower to meters