Your model is 16 inches long. it is an exact model of a locomotive that is 40ft long. a window is how many times wider that a window on the model?

The ratio is 16:40 which is 2:5 so a window of 2 on the model would be 5 on the locomotive so its 2.5 times wider

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.