To find out how long it took Dita to finish the race, you can use the formula:
\[ \text{Time} = \frac{\text{Distance}}{\text{Rate}} \]
In this case, the distance is 100 meters and the rate is 6.25 meters per second:
\[ \text{Time} = \frac{100 \text{ meters}}{6.25 \text{ meters/second}} = 16 \text{ seconds} \]
So, the correct answer is:
16 seconds.