Do any one understand this question?

No it looks confusing

You are trying to find the distance of A which can be accomplished using the distance formula and the point two point making line A I believe

The distance formula is
D=squareroot (x-x) + (y-y)

The first x and y are from the same coordinates

I believe the answer is that the distance of A is 10

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.