Jake G. answered 04/10/20
Motivated, Experienced Math Tutor, 5+ years
I believe that this is asking you to explain John's rate of 3/5 pools per hour.
The 3/5 rate means that John will clean 3 pools every 5 hours, or .6 pools per 1 hour. The ratio of pools to hours is .6, or 3/5, as is given in your problem.
I am not sure if this is helpful Michael, but please reach out for further help. My hours are very flexible!