What is Jonathan's average speed in miles per hour if he parachutes from 3.5 miles in 0.1 hours?

To determine Jonathan's average speed, you need to use the formula for average speed, which is the total distance traveled divided by the total time taken.

In this scenario, Jonathan parachutes a distance of 3.5 miles over a period of 0.1 hours. By plugging these values into the formula, the calculation would be:

Average Speed = Total Distance / Total Time

Average Speed = 3.5 miles / 0.1 hours

When you perform this division, you convert the time from hours to minutes. Since there are 60 minutes in an hour, 0.1 hours equals 6 minutes. This translates into:

3.5 miles is the distance and 0.1 hours is equivalent to 6 minutes or 1/10 of an hour.

Calculating gives:

Average Speed = 3.5 miles / 0.1 hours = 35 miles per hour.

This means Jonathan's average speed while parachuting is 35 miles per hour, which corresponds to the choice provided. Thus, choice B is indeed correct as it directly reflects the computed value.