A person has a watch and an alarm clock, the watch is 30 seconds behind the alarm clock every hour, and the alarm clock is 30 seconds ahead of standard time. Q: How many seconds does this watch differ from the standard time in one day and night?
某人有一块手表和一个闹钟，手表比闹钟每小时慢30秒，而闹钟比标准时间每小时快30秒．问：这块手表一昼夜比标准时间差多少秒？
<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<gadget id="calculator">720 - 714</gadget>
<output>6</output>

<result>6</result>