问答题 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
【正确答案】
【答案解析】21:00 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。