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[Problem Solving]

试题详情

题目:

A certain pilot flew 400 miles to City K at an average speed of 350 miles per hour with the wind and made the trip back at an average speed of 250 miles per hour against the wind. Which of the following is closest to the pilot's average speed, in miles per hour, for the round-trip?

选项:

A、280
B、290
C、300
D、310
E、320

答案:

B

提问:

题干读懂了,但是不知道怎么下手。

解答:

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阅读760
解答: sysadmin

提问:

题干读懂了,但是不知道怎么下手。

解答:

点赞0
阅读761
解答: sysadmin老师

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