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  3. A car traveled from A to B in 30 minutes.The first half of the trip was covered

A car traveled from A to B in 30 minutes.The first half of the trip was covered

游客2023-10-17  74
问题 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?
选项 A、400/11
B、500/11
C、600/11
D、700/11
答案 C
解析 题目问一辆车从A处到B处用时30分钟。前一半路程的速度为50公里每小时,后一半路程的速度为60公里每小时,问平均时速是多少?这是一道计算题,假设平均时速为X,则0.25X/50 +0.25X/60=0.5,进而可得X =600/11,因此平均时速为600/11公里每小时。
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