Which measurement is most precise? 5.2 miles
1000 miles
3.81 miles
523.1 miles

And please give an explanation

I believe 3.81 miles is the most precise, because it has the most decimal spaces and the others are probably estimated values

When rates are expressed as a quantity of 1, such as 2 feet per second or 5 miles per hour, they are called unit rates. if you have a multiple-unit rate such as 120 students for every 3 buses, and want to find the single-unit rate, write a ratio equal to the multiple-unit rate with 1 as the second term.