A boat traveled upstream adistance of 90 miles at an average speed of (v - 3) miles per hour and thentraveled the same distance downstream at an average speed of (v + 3) miles perhour. If the trip upstream took half anhour longer than the trip downstream, how many hours did it take the boat totravel downstream?


2.5

2.4

2.3

2.2

2.1

考题讲解
还没有题目讲解(毕出老师会陆续发布对官方考题的解读,请保持关注)。

登录注册 后可以参加讨论

Prep2007E1-PS