The quote mentioned how many minutes the ship saileth in an hour, and the reason for this is that in this case a minute isn’t a unit of time, but a measurement of angle.
If you look at a clock and the time is 3:15, what is the Angle between the hour and the minute hands?
如果你看时钟的时间是3：15，什么是之间的夹角小时和分钟的手里？
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The circular arc automatic door is reciprocating swing, and its motion parameters are the number of swing per minute, the size of the swing Angle and the travel speed ratio coefficient.