[求助]problem solving

yahoo750

A certain clock makes every hour by stricking a number of times equel to the hour and the time required for a strock is exactly equal to the time interval between strokes. At 6:00 the time lapse between the beginning of the first stroke and the end of the last stroke is 22seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke. The correct answer is 46. But how to get it? Could anyone help me?[em27]

tongxun

6点打6下，间隔5次，22/11=2秒
12点打12下，间隔11次，12*2+11*2=46

yahoo750

请问，间隔5次，用22/11是何意思？谢谢。

yahoo750

我已真的明白式子的含义了。太谢谢了！

tongxun

别客气。