If a jet flies 624 miles in 4 hours, what's its average speed?

To determine the average speed of the jet, you use the formula for speed, which is distance divided by time. In this scenario, the jet covers a distance of 624 miles in a time span of 4 hours.

By applying the formula:

Average speed = Distance / Time

Substituting the provided values:

Average speed = 624 miles / 4 hours = 156 miles per hour.

The average speed of 156 miles per hour signifies how many miles the jet travels in one hour.

The choice labeled as B, which presents the answer as 156.0, is correct because it maintains the precision of the calculation. In contexts such as scientific reporting or when precision matters, including a decimal point to indicate that the value is not just an integer can be significant. While 156 and 156.0 represent the same numerical value, the inclusion of the decimal reinforces the idea that the figure is a result of precise measurement. Therefore, either representation of 156 is valid, but providing it as 156.0 aligns well with a consistent format that often appears in data presentation.