To find out how long it would take for the dolphin to swim 45 nautical miles at a speed of 25 knots, we can use the formula relating distance, speed, and time:
\[ \text{Time} = \frac{\text{Distance}}{\text{Speed}} \]
In this case:
- Distance = 45 nautical miles
- Speed = 25 knots
Now, substituting the values into the formula:
\[ \text{Time} = \frac{45 \text{ nautical miles}}{25 \text{ knots}} = 1.8 \text{ hours} \]
So, it would take the dolphin 1.8 hours to swim 45 nautical miles at a speed of 25 knots.
To verify the units:
- Distance is in nautical miles.
- Speed is in knots, which is equivalent to nautical miles per hour.
Thus, the units correctly cancel out:
\[ \text{Time} = \frac{\text{nautical miles}}{\text{nautical miles/hour}} = \text{hours} \]
The process to find the time involves dividing the distance by the speed, and you confirmed that the resulting unit is indeed hours.
The answer is 1.8 hours.