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一道英语智力题At 12 noon my watch was correct.However,it then start

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一道英语智力题
At 12 noon my watch was correct.However,it then started to lost 18minutes per hourFour hours ago it stopped completely and is now showing the time as 15:30. What is the correct time now?
答案是9pm 想问问是怎么算出来的.
一道英语智力题At 12 noon my watch was correct.However,it then start
中午十二时,我的手表是正确的.
然而,随后开始每小时慢十八分钟
四个小时前完全停了,现在显示的时间为15:30.
正确的时间是什么呢?
现在显示的时间为15:30,四个小时前,就是这个时间.那时停了,从12:00到15:30
一共有“三个半小时”
每小时慢十八分钟,就是说,每走42分钟,就是实际一小时.
(7/2)*60 除以42 =5小时.
就是说:四个小时前,显示的时间为15:30,其实应该是:12+5=17点,下午五点.
这是四小时前,那么现在就是晚上9点.