It depends. An average person might run it in anywhere from 30-45 minutes (10-15 min per mile). Someone who is athletic but not really a runner might do it in 27-36 minutes (9-12 min per mile). A cross country runner could run it as fast as 15-16 minutes, but most likely in 18-24 (someone new to cross country might do like 25-32). Personally, assuming you're just an average person, I think if you can run 3 miles in 33-36 minutes that's decent.
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6 minutes and 8 seconds
3 minutes and 45 seconds
around 3 and a half hours.
20 minutes. But you would be walking unless you were very small.
One mile is approximately 1.6 kilometres, so 400 metres in 3 minutes would be a mile in 12 minutes.