Since Juliet is 45 meters away from the 10-meter mark of the track, the 10-meter mark is 10 meters away from the 0 mark at the start of the track. To know her distance to the beginning, you must add 10 to any distance from the 10-meter mark. To solve her total distance, add 45 and 10. As a result, she is 55 meters away from the start of the track.