There is an alarm clock that is 6 minutes fast all day and night. Xiaohua wants to catch the train and wants the clock to go off on time at 8:00 Beijing time tomorrow morning. Then when Xiaohua sets the clock at 4:00 this afternoon, how many minutes should it be slowed down.
有一个闹钟一昼夜快6分钟，小华要赶火车，想让这个钟在明天早上北京时间8点准时闹，那么当小华在今天下午4点对钟时，应往慢拔多少分钟．
<gadget id="calculator">24 / 6</gadget>
<output>4</output>

<gadget id="calculator">16 / 4</gadget>
<output>4</output>

<result>4</result>