If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now

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问题 If it were two hours later, it would be half as long until midnight as it would be if it were an hour later. What time is it now9

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答案21:00

解析设现在的时间为x，根据题意可得下列方程式：24-(x+2)=1/2[24-(x+1)], 得x=21，所以现在是21:00。

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