Final answer:
Your running speed decreased from 12 miles per hour last year to 5 miles per hour this year. Several factors, including physical condition and training intensity, could explain the change in speed.
Step-by-step explanation:
To calculate how your speed changed from last year to this year, we will find your average speed for each year and compare. Last year, you ran 2 miles in 10 minutes, which gives us a speed of 2 miles / 10 minutes = 0.2 miles per minute, or 12 miles per hour (mph). This year, you ran 1 mile in 12 minutes, which is a speed of 1 mile / 12 minutes = 0.0833 miles per minute, or 5 miles per hour (mph).
Comparing these speeds, we see that you used to run much faster last year at 12 mph compared to this year's 5 mph. Factors that can contribute to changes in speed include changes in physical condition, training intensity, motivation, or possibly even health issues. If you consider the data provided, 40 percent of runners ran at speeds of 7.5 miles per hour or less, which means your current speed is slower than that benchmark. In contrast, last year's speed put you above that statistic as one of the 60 percent of runners who ran faster than 7.5 miles per hour.