4.08 seconds
18000 yards = 10.23 miles a person can comfortably walsk at 3 miles an hour so it would take 3.41 hours to cover 18000 yards.
About 3.4 seconds.
139 yards per 25.75 seconds is probably 11.04 miles/hour.
Roughly 3.199 seconds.
There are 1760 yards in one mile. Therefore, 5 miles per hour is equal to 5 x 1760 = 8800 yards per hour. To travel 400 yards at 5 miles per hour would take 400/8800 x 60 = 2.72 recurring (that is, 2.727272...) minutes or 2 minutes 43.63 recurring (that is, 2 minutes 43.636363...) seconds.
About 2.05 seconds.
3,500 yards is 1.99 miles.
10,000 yards is 5.68 miles.
500 yards is 0.28 miles.
1 hour.
One hour.
At 80 miles per hour, one hour. At sixty miles per hour, 80 minutes.