watch is 30 seconds faster than the alarm clock per hour, and this alarm clock is 30 seconds slower than the standard time per hour. How many seconds is the difference between the watch and the standard time in one day and night (24 hours)?
一只手表比闹钟每小时快30秒，而这只闹钟每小时比标准时间慢30秒，手表与标准时间一昼夜(24小时)相差多少秒？
<gadget id="calculator">30 * 24</gadget>
<output>720</output>

<gadget id="calculator">23.8 * 30</gadget>
<output>714</output>

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

<result>6</result>