1. **State the problem:** We need to find the average braking distance in feet at a speed of 60 miles per hour from the given bar chart. 2. **Analyze the chart:** The chart shows horizontal bars representing braking distances for speeds 20, 30, 40, 50, 60, 70, and 80 mph. 3. **Locate the 60 mph bar:** According to the description, the bar lengths increase with speed, and the 80 mph bar reaches near 280 feet. 4. **Estimate the 60 mph bar length:** Since the 60 mph bar is between 50 mph and 70 mph bars, and the 80 mph bar is near 280 feet, the 60 mph bar is approximately near 140 feet (roughly half of 280 feet). 5. **Final answer:** The average braking distance at 60 mph is approximately **140 feet**.