Final answer:
The problem related to backpacker average velocity is analyzing the factors affecting a backpacker's average velocity.
Step-by-step explanation:
The problem related to backpacker average velocity is option 3) Analyzing the factors affecting a backpacker's average velocity.
When calculating the average velocity of a backpacker, we need to consider factors such as the distance traveled and the time taken. Average velocity is calculated by dividing the displacement (change in position) by the elapsed time. Various factors like the terrain, backpack weight, fitness level, and walking speed can affect the average velocity of a backpacker.