At 12 noon my watch was correct.However,it then started to lose 18 minutes per hour.Four hours ago it stopped completely and is now showing the time as 15:30.What is the correct time now?为什么?
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At 12 noon my watch was correct.However,it then started to lose 18 minutes per hour.Four hours ago it stopped completely and is now showing the time as 15:30.What is the correct time now?为什么?
At 12 noon my watch was correct.However,it then started to lose 18 minutes per hour.Four hours ago it stopped completely and is now showing the time as 15:30.
What is the correct time now?
为什么?
At 12 noon my watch was correct.However,it then started to lose 18 minutes per hour.Four hours ago it stopped completely and is now showing the time as 15:30.What is the correct time now?为什么?
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clever! I hate maths!
现在时间为21点。
设从12点到表停止共经过X分钟,每分钟表慢18/60分钟,表显示一共走了5*60+30=210分钟。X=X*18/60+210,得出X为300分钟,正好五个小时,那么表停止的时候应该是12+5=17点,这是在四个小时之前,所以现在时21点。
8:33
现在15:30,停了4个小时,加上4个小时就是7:30
从12点到15:30 过了3个半小时.
也就是在3个半小时内每小时慢18分钟.
3个半小时内就慢了 18*3+9 = 63分钟
把慢了的 63分钟加到7:30上
就是正确时间 8:33