Final answer:
It will take Diana and her family 90 minutes to reach the campsite.
Step-by-step explanation:
To solve this problem, we need to use the formula distance = speed * time. In this case, the distance is 3 miles and the speed is 2 mi/h. We want to find the time it will take to travel 3 miles at a speed of 2 mi/h.
Using the formula, we can set up the equation: 3 miles = 2 mi/h * time. To isolate the variable time, we divide both sides of the equation by 2 mi/h: time = 3 miles / 2 mi/h.
Now, we can calculate the time it will take. Divide 3 miles by 2 mi/h to get the time in hours: time = 1.5 hours.
Convert the time in hours to minutes by multiplying it by 60 minutes/hour: time = 1.5 hours * 60 minutes/hour = 90 minutes.