求教OG12数据充分性的104题

mermaid2011

AT what speed was a train traveling on a trip when it had completed half of the total distance of the trip?
1.The trip was 460 miles long and took 4 hours to complete
2.the train traveled at an average rate of 115 miles per hour on the trip

答案给的是E
但是我觉得要么是B，要么是C，
怎么也不可能是E啊。
求教，谢谢啦！

mermaid2011

我晕，看错了，谢谢各位啊！

leslielu

谁告诉你是匀速了？是平均好吧，平均不等于匀速

mermaid2011

2不是说匀速吗？匀速行进，整段路程不都应该是115吗？怎么求不出来了？
求解释

ChinaHawk

注意问题是：
AT WHAT SPEED..
就是问的是具体速度，不是平均速度，所以求不出来。