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题目:
If two workers can assemble a car in 8 hours and a third worker can assemble the same car in 12 hours, then how long would it take the three workers together to assemble the car
选项:
A、512 hrs
B、225 hrs
C、2 45 hrs
D、312 hrs
E、4 45 hrS
答案:
E
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这道数学题的选项什么意思啊,完全懵了==!三个人一起工作用的时间不是应该更少吗?怎么选项的答案都这么大啊...我觉得是1/[(1/8)+(1/12)]不知道对不对?还是我理解题目有问题??
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