Final answer:
Adriel's average speed is 27 miles per hour, so in 3 hours, he would travel 81 miles at the same rate.
Step-by-step explanation:
To calculate the distance Adriel would travel in 3 hours at the same rate, we first find his average speed during the 8 hours. To find this, we divide the total distance by the total time:
Average speed = Total distance / Total time
= 216 miles / 8 hours
= 27 miles/hour
Now, to find the distance Adriel would travel in 3 hours, we multiply his average speed by the period:
Distance in 3 hours = Average speed x Time
= 27 miles/hour x 3 hours
= 81 miles
Therefore, if Adriel continued at the same rate, he would travel 81 miles in 3 hours.