As shown in the figure below, a squirrel is looking for nuts. It first runs rightward 3\,\text m3m3, start text, m, end text and runs leftwards another 10\,\text m10m10, start text, m, end text to a second nut, and then runs 3\,\text m3m3, start text, m, end text leftward to a third nut. The total time spent running was 12\,\text s12s12, start text, s, end text.