2. 职称英语
  3. An aircraft flew from A to B at an average speed of 230 mph. It returned from B

An aircraft flew from A to B at an average speed of 230 mph. It returned from B

游客2024-08-21  49
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?
选项
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。
转载请注明原文地址:http://tihaiku.com/zcyy/3728771.html
相关试题推荐
随机试题
最新回复(0)