2. 外语
  3. 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

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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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