【GMAT考满分数学PS题库】A takes 4 hours to complete a task alone. It takes_真题_答案_解析 GMAT考满分官网

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题目内容

A takes 4 hours to complete a task alone. It takes 3 hours for A and B to finish the task at the same time. How many hours does it take for B to finish the task alone?

A4
B6
C8
D10
E12

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正确答案: E

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