It would take him 30 minutes.
You divide 10 miles by 2 to get 5 miles. So you would take 1 hour dived by 2 to get 1 half hour or 30 minutes.
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6 hours and 9 minutes.
You have been running for 2.5 hours.
time = distance/speed time = 12/4 = 3 hours
Half an hour down stream one and a half hours upstream if the water is running at about 1 mile an hour.
21 miles is exactly 21 miles long or if you prefer 36960 yards long. 21 miles is also 110880 feet long and 1,330,560 inches long.