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5. 1353-!-item-!-187;#058&000886 Working alone at its own constant rate, a machine seals k cartons in 8 hours, and working alone at its own constant rate, a second machine seals k cartons in 4 hours. If the two machines, each working at its own constant rate and for the same period of time, together sealed a certain number of cartons, what percent ofthe cartons were sealed by the machine working at the faster rate?
答案是66又三分之二%,好像! 求助各位,没看懂题,主要不知道在问什么!谢谢了 |
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