→ koala0416:謝謝D大!!!! 09/16 12:02
※ 引述《koala0416 (koala)》之銘言：
: 33
: Anne traveled from City A to City B in 4 hours, and her speed was between 25
: miles per hour and 45 miles per hour. John traveled from City A to City B
: along the same route in 2 hours, and his speed was between 45 miles per hour
: and 60 miles per hour. Which of the following could be the distance, in
: miles, from City A to City B?
: A. 95 B. 115 C. 125 D. 160 E. 180
: 麻煩版上高手解答 是要用平均速率來算嗎?
這是兩個獨立的個體 所以要找交集:
Anne: V: 25 ~ 45
T: 4
D: 100 ~ 180
John: V: 45 ~ 60
T: 2
D: 90 ~ 120
兩個交集: 100 ~ 120
Answer: B
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