The answer to the question is as wide ranging as people are wide ranging. In general, for a person in "pretty good" shape, i.e. runs a couple times a week, if you can maintain a 5/KM run rate you are doing pretty well.
That would be 25 minutes for a 5k. 20 minutes would be considered good shape and when you get into the 15 minute range you are doing very well.
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Sub 20 for a Man and sub 25mins for a girl is a good time.
1h = 60 min so 1h and 20 min = 60 + 20 = 80 min
10:05 --> 10 * 60 min + 5 min = 605 min 08:20 --> 8 * 60 min + 20 min = 500 min 605 min - 500 min = 105 min (= 1 3/4 hr)
A 20 minute lesson would mean 80 minutes of practice.20 = X Cross Multiply 5X = 400 Solve for X5X = 4005 20 /5 /5X = 80
20"