In this problem, you would just divide your test results by the maximum test points you can get. 60 divided by 75 is 0.8, which is 80%, which is probably a grade I will never see in my life :P Hope I helped!
Keeping in mind that, there are 5280 feet in 1 mile, and 60 minutes in an hour and 60 seconds in each minute, thus 60*60 seconds in an hour, or 3600 seconds.
