A car traveled from A to B in 30 minutes.The first half of the trip was covered at 50 mph,and the second half at 60 mph.What was the average speed?

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A car traveled from A to B in 30 minutes.The first half of the trip was covered at 50 mph,and the second half at 60 mph.What was the average speed?
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A car traveled from A to B in 30 minutes.The first half of the trip was covered at 50 mph,and the second half at 60 mph.What was the average speed?
A car traveled from A to B in 30 minutes.The first half of the trip was covered at 50 mph,and the second half at 60 mph.What was the average speed?

A car traveled from A to B in 30 minutes.The first half of the trip was covered at 50 mph,and the second half at 60 mph.What was the average speed?
前一半路程50码 后一半路程60码 可以画一下v-t 图,两个矩形面积相等,可以解得前后两次时间比为6:5,总时间为单位11,则平均v=(50*6 60*5)/11=600/11

50*6/11+60*5/11=54.54545454.。。。。。。

设路程为s
则x/2/50+x/2/60=1/2
解得x=300/11
所以平均速度v=x/t=300/11/2=150/11

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