31,000 feet = 5.87 miles.
19262 miles and 892 yards
31000 km per hour is roughly 19263 miles per hour. Note how I said miles per hour and not miles. You can not convert a speed to a distance. You can only convert units that measure the same sort of thing, like speed.
19,262.5 miles (km x 0.621371 = miles).
About 11-13k
A step is not a consistent unit of measurement. Various people's steps can measure different lengths.
By 1860 the US had almost 31,000 miles of railroad tracks.
5.7% of 31,000= 5.7% * 31000= 0.057 * 31000= 1,767
3 miles = 15,840 feet 6 miles = 31,680 feet
Three miles = 15,800 feet.
1.136364 miles.
1.15 miles
4.5 miles is 23,760 feet.