At what time does the boy arrive at school according to himself?

M: What I should remind you is that your boy is sometimes 25 minutes late for the class.
W: Really? But he always tells me that he usually earlier ten minutes earlier for the class. This time he is surely to get punished.

W: You lend me the book. I’m sure I can finish reading it before Friday.
M: I do think that I myself should be the first reader.