Read the following dialog and answer the question.

Mrs. Tia:  What time is it, Mr. Huda?
Mr. Huda:  It is twenty past twelve. Do you have classes to teach?
Mrs. Tia:  No. I’m waiting for Reni. She wants to borrow my mathematics book.
Mr. Huda:  What a good student!
Mrs. Tia:  Yes. She is very diligent.
Mr. Huda:  The class is not over yet. She is probably going here right after the bell rings.

The conversation occurs at ....