Final answer:
John's speed is 25/18 miles per hour.
Step-by-step explanation:
To find John's speed in miles per hour, we need to divide the distance he walked by the time it took him. John walked 5/6 of a mile in 3/5 of an hour.
To divide fractions, we multiply the first fraction by the reciprocal of the second fraction. So, (5/6) ÷ (3/5) = (5/6) x (5/3)
= 25/18.
Therefore, John's speed is 25/18 miles per hour.