Ms. Chen: Excuse me. I would like to visit the museum. When is the next guided tour? Ticket person: In 10 minutes. Ms. Chen: Oh, we are so lucky to arrive here in time. How long does it last? Ticket person: About 40 minutes. Ms. Chen: I see. Then three tickets please. Here are six hundred dollars. Ticket person: Thank you. The tour will start over there by the steps.

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