Final answer:
At a rate of 4 miles per hour, it will take 0.75 hours or 45 minutes to walk 3 miles.
Step-by-step explanation:
To solve how long it will take to walk 3 miles based on the given information, we need to first establish the rate of walking. The student has walked 2 miles in half an hour, which is 0.5 hours. To find the rate, we divide distance by time:
Rate = Distance / Time = 2 miles / 0.5 hours = 4 miles/hour
Now, to find out how long it will take to walk 3 miles at this rate, we use the formula:
Time = Distance / Rate = 3 miles / 4 miles/hour = 0.75 hours
Therefore, it will take 0.75 hours or 45 minutes to walk 3 miles at this rate.