A person's distance from home, in miles, is recorded over a 3-hour period. The person starts at home (0 miles). For the first 30 minutes, they travel away from home at a constant speed, reaching a distance of 15 miles. They then stay at that location for 1 hour. After that, they travel back towards home at a constant speed, reaching a distance of 5 miles from home by the end of the 3-hour period. Which of the following statements is NOT true?
The person's average speed during the first 30 minutes was 30 miles per hour.
The person was stationary for one-third of the total trip duration.
The person traveled a total distance of 30 miles during the 3-hour period.
The person's speed while traveling back towards home was less than their speed while traveling away from home.
