>>6
If it is in the E3 euclidean space, then the measure is typically called "volume." If it is E2, then the measure is typically called "area." Since this question is referring to area, it is obviously operating in E2, asking about an elementary set which is the Cartesian product of (0,10) and (0,l) with a measure of 120, and asking about the value of l. In other words,
>this is elementary school
is perfectly correct.