Finish the following sentence with the best choice: How long do you have to walk to burn off 100 calories?

Choices:
- Walking at about a mile every 15 minutes, you would walk for 30 minutes, or 2 miles. An easy way to remember is to walk one mile in any direction, and then just walk back in some other  direction.
- Walking at about a mile every 15 minutes, you would walk for 30 minutes, or 2 miles. An easy way to remember is to walk one mile in any direction, and then just walk back in the opposite direction.

Answer:
Walking at about a mile every 15 minutes, you would walk for 30 minutes, or 2 miles. An easy way to remember is to walk one mile in any direction, and then just walk back in the opposite direction.