Final answer:
The total distance Felipe walked is represented by the expression 5/3D, where 'D' is the distance from Felipe's house to the school.
Step-by-step explanation:
Tim lives 2/3 as far from school as Felipe. To determine the total distance Felipe walked, we can use the distance Felipe walks to school and to Tim's house to form an expression.
Let's assume the distance from Felipe's house to school is represented as 'D'. Since Tim lives 2/3 as far from the school as Felipe, the distance from Tim's house to school is 2/3D. Therefore, when Felipe walks to school and then to Tim's house, the total distance he walks is from his house to school plus from school to Tim's house.
Total distance Felipe walked = Distance to school + Distance from school to Tim's house
= D + 2/3D
= 5/3D
Thus, the expression representing the total distance Felipe walked is 5/3D.