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Water started running into an empty tank and continued running until it was filled to its capacity. Water ran at a constant rate of 200 kiloliters per minute for the first 20 minutes and then at a constant rate of 100 kiloliters per minute until the tank was filled. If it took a total of 80 minutes to fill the empty tank to its capacity, how many minutes did it take to fill the tank to $$\frac{1}{2}$$ of its capacity?
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· 相关考点
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。
