forty five minutes
Half an hour down stream one and a half hours upstream if the water is running at about 1 mile an hour.
Just over 6½ minutes.
Age is of very little importance to running a 5K race. As long as you are in good shape and are confident in your ability to complete your goal, you are able to take part in a 5K race.
1) Race: noun, as in a running competition, or as an ethnic group.2) To race: verb, to take part in a running competition, or as abnormally fast heart rate.
About an hour
One hour to a half an hour.... not very long
100 seconds. 1 m/s 3x108
A half hour-an hour.
Roughly an hour