Hmm... depends on what country you're in. In America I would venture to say that the average 5th grade girl wouldn't even start running in the first place but if forced will probably finish it by the end of the period after expending twice the effort in complaining how long it took and how hard it was.
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It depends on the girl's physical abilities. A good 400 runner for a 7th grader should range from 60 to 65 seconds.