Final answer:
The Chu family will take 5 hours to hike 15 miles at their hiking speed of 3 miles per hour.
Step-by-step explanation:
To determine how long it will take the Chu family to hike 15 miles at a rate of 3 miles per hour, you would use the formula Time = Distance ÷ Speed.
The distance they need to hike is 15 miles, and their speed is 3 miles per hour. Using the formula:
Time = 15 miles ÷ 3 miles per hour = 5 hours.
Therefore, it will take the Chu family 5 hours to hike 15 miles if they maintain a constant speed of 3 miles per hour.