Jenna and Kyle are working together to address a stack of envelopes for a charity's fundraising drive. Jenna can address 10 more envelopes per hour than Kyle. The total time, in hours, it will take the two students to address all the envelopes is represented by the expression below. 1,800/x + 1,800/x+10

Which statement is true?

A.

The number of envelopes Kyle can address in an hour is represented by 1,800/x.

B.

The total time, in hours, it would take Jenna working alone to address 1,800 envelopes is represented by 1,800/x + 10 .

C.

The variable x in the expression is not associated with a specific student and can represent either Jenna or Kyle.

D.

The numerators represent the total of 3,600 envelopes in the stack.