Final answer:
Isaac's walking rate is calculated by dividing the distance walked (6/10 of a mile) by the time taken (1/5 of an hour), resulting in a walking rate of 3 miles per hour. Therefore, the correct answer is option A. 3 miles per hour.
Step-by-step explanation:
Isaac walks 6/10 of a mile in 1/5 of an hour. To find Isaac's walking rate in miles per hour, we can set up a proportion considering that speed is the ratio of distance traveled to the time taken. First, we convert 1/5 of an hour to a whole hour to find Isaac's speed for one hour.
To make this calculation, divide the distance by the time:
6/10 mile ÷ 1/5 hour = (6/10) × (5/1)
= 30/10
= 3 miles per hour.
This is Isaac's constant walking speed, so the correct answer to the question is that Isaac's walking rate is 3 miles per hour, which corresponds to option A.