To find the fastest speed of the dolphin, we can use the formula for speed:
\[ \text{Speed} = \frac{\text{Distance}}{\text{Time}} \]
In this case, the distance is 1,000 meters and the time is 66.7 seconds. Plugging in the values:
\[ \text{Speed} = \frac{1000 , \text{m}}{66.7 , \text{s}} \]
Calculating that:
\[ \text{Speed} \approx 15 , \text{m/s} \]
So the fastest speed of a dolphin is 15 m/s.