一道英文奥数题,A car traveled from A to B in 30 minutes.The first h
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一道英文奥数题,
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?
选择A:400/11 B:500/11 C:600/11 D:700/11
先翻译,再选择,并说明理由.
可不知理由啊。请详细说明理由
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?
选择A:400/11 B:500/11 C:600/11 D:700/11
先翻译,再选择,并说明理由.
可不知理由啊。请详细说明理由
一辆汽车从A地开向B地用了30分钟.前半段路程的速度为50MPH,后半段的速度为60MPH,求汽车的平均速度是多少?
选择:C
设前半段用了X分钟,后半段用了(30-X)分钟,可得方程:50X=(30-X)乘60
解出方程,算出前半段和后半段所用时间,可得出总路程,总路程除以总时间就是平均速度
选择:C
设前半段用了X分钟,后半段用了(30-X)分钟,可得方程:50X=(30-X)乘60
解出方程,算出前半段和后半段所用时间,可得出总路程,总路程除以总时间就是平均速度
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