Abox has dimensions of 14 inches long, 1.5 feet wide, and 7 inches high. what is the volume of the box?

We have to make ALL the units equal.
So, we could calculate 14" by 18" by 7" = 1,764 cubic inches 
ORwe could calculate 1.1666666666 by 1.5 by  0.5833333333 =  1.0208333333cubic feetthere are 1,728 cubic inches i a cubic foot so this equals 1.0208333333 * 1,728 = 1,764 cubic inches

So, both answers are correct.

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.