A yardstick is usually 3 feet long. The fact that Emma has two-yard sticks means that she already has 6 feet when she placed them from point to point. She also has a 12-inch ruler which is equal to 1 foot. Based on the numbers that are gathered, she has 3+3+1 =7 feet.
This means that the answer to this question is 7 feet. If you are not familiar with how a yardstick looks like, this is a type of flat board that is thin enough to be called a stick. It has markings on it that is made to measure what this can do.