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Machine $$X$$, working at a constant rate, can perform a job in $$T$$ hours. Machine $$Y$$, working at a different constant rate, can perform the same job in $$3T$$ hours. If the two machines work simultaneously at their respective constant rates, how many hours will it take for the machines to perform the job, in terms of $$T$$?
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2.5.2 工作效率题
2.5.2 工作效率题
以上解析由 考满分老师提供。
