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标题: 請教TTGWD18-14 [打印本页]

作者: maydaythekid 时间: 2007-9-11 07:04 标题: 請教TTGWD18-14

Q14:

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?

A. 280

B. 290

C. 300

D. 310

E. 320

作者: bastencools 时间: 2007-9-11 14:03

2/(1/350+1/250)

作者: maydaythekid 时间: 2007-9-12 13:47

我的GWD解答寫B

請問是答案錯嗎

作者: nikema 时间: 2007-9-12 20:32

算一下，大概是291!!

作者: shawlen 时间: 2007-12-17 15:02

800/(400/350+400/250),很EASY呀

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