Final answer:
To find the rate of travel in miles per hour when someone traveled 221 miles in 3 hours and 15 minutes, convert 3 hours and 15 minutes to 3.25 hours and use the formula ‘distance = rate x time’ to get an average speed of 68 miles per hour.
Step-by-step explanation:
To determine the rate in miles per hour for someone who has traveled 221 miles in 3 hours and 15 minutes, you can use the formula for average speed, which is distance divided by time.
First, you need to convert the time of 3 hours and 15 minutes into hours.
Since there are 60 minutes in an hour, 15 minutes is equal to 0.25 hours, so the total time in hours is 3 + 0.25 = 3.25 hours.
Next, substitute the given values for distance and time into the formula:
- Distance = 221 miles
- Time = 3.25 hours
Therefore, the average speed would be:
Rate = Distance / Time
= 221 miles / 3.25 hours
= 68 miles per hour.
Checking the reasonableness of the answer - if you travel at a constant speed of 68 miles per hour for 3 hours and 15 minutes, you would cover exactly 221 miles.