What does the formula Speed = distance / time calculate?

The formula Speed = distance / time is used to calculate how fast something is moving over a certain distance within a specific timeframe. When rearranging the formula, if you have the speed and you want to determine the time taken for a particular distance, you can express time as time = distance / speed.

This context is important because it highlights that the formula directly relates distance and time with speed as the ratio. Therefore, if you know the distance and the speed, you can accurately calculate the time taken to travel that distance, making option B correct in indicating the formula's purpose.

The other choices do not align with this relationship. For example, the first option incorrectly suggests that the formula determines the distance for a specific time rather than revealing the time for a certain distance. The third option leans towards average speed calculations over multiple trips but does not directly relate to the basic formula, which deals with instantaneous speed. The fourth option is unrelated as it discusses a financial aspect rather than a physical measurement of speed or time.