What formula represents speed using distance and time?

The formula that correctly represents speed in relation to distance and time is derived from the understanding of how speed is defined. Speed is a measure of how quickly an object covers a certain distance over a specified period of time. The fundamental relationship is that speed equals the total distance traveled divided by the time it takes to travel that distance. Thus, the appropriate formula is speed equals distance divided by time.

This computation is crucial in navigation and seamanship, as understanding speed helps in determining ETA (Estimated Time of Arrival) and in planning safe and efficient travel on the water. It allows mariners to calculate how long a voyage will take based on their speed and the distance they need to cover, which is essential for navigation.

The other options do not reflect the correct mathematical relationship for speed. For instance, dividing time by distance does not offer any meaningful measure of speed and would not yield the desired result in practical navigation scenarios. Similarly, multiplying distance by time or using time as a multiplier does not align with the foundational principles of motion and speed calculations.