Read the following conversation and answer the question.

W: Hi, John. What are you doing here?

M: I'm waiting for the bus.

W: Where are you going?

M: I'm going to the station to meet my sister.

W: Oh, is she coming by herself?

M: Yes, the train comes in about half past four, but it's twenty past four now. I have only ten minutes!

W: How often does the bus run?

M: Every ten minutes. I missed a No. 1 bus 15 minutes ago, and the next one hasn't come yet!

Question: How often does the No. 1 bus run? 

- Every 5 minutes.

- Every 10 minutes.

- Every 15 minutes.


Every 10 minutes.