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An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was it
An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was it
admin
2019-04-10
59
问题
An aircraft flew from A to B at an average speed of 230 mph. It returned from B to A at an average speed of 300 mph. What was its average speed for the two journeys?
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答案
260 mph
解析
(设飞机从A到B耗时a小时,从B到A耗时b小时,那么可得出230a=300b;飞机飞行整个路程中所用的平均速度则为300b/(a+b);将两个方程式合并,便可得出平均速度约为260.3 mph,四舍五人后取结果260mph。
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本试题收录于:
D类竞赛(专科)题库大学生英语竞赛(NECCS)分类
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D类竞赛(专科)
大学生英语竞赛(NECCS)
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