请教OG数学上一道题
OG数学(绿色本)
P76,第110题
A certain clock marks everyhour by striking a number of times equal to the hour, and the time required for a stroke 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 22 seconds. At 12:00, how many seconds elapse between the beginning of the first stroke and the end of the last stroke?
答案是46,虽然有讲解,可是还是不明白
6点的interval不应该是5个么?