Dialogue: W: How can I get to the airport? M: You can to there by subway, by bus, or by taxi. The subway is the quickest, but the bus is the cheapest. Question: What can we learn from the conversation? - It saves time to go by subway. - It saves money to go by subway. - There's no direct bus to the airport.
The answer to this question is:
It saves time to go by subway.