A、24 dollars. B、15 dollars. C、20 dollars. D、25 dollars. A根据First class is 24 dollars more. 可知，男士如果买头等票就要多花24美元，故选A。

M: We want to take a train to New York.
W: Regular or express train?
M: How much time would I save if we took the express?
W: About one hour. The next express train arrives in New York at 3:15.
M: And how much more do i have to pay for the express?
W: First class is 24 dollars more, and second class is 15 dollars more.
M: As long as we can arrive one hour earlier, I don’t mind paying a little extra. Then give me one second class ticket on the express, please.
W: OK, one second class ticket. Here you are.
M: Thank you.
Q6. How much more does the man have to pay for the first class express?
7.What kind of ticket has the man bought?