An alarm clock slows down by 4 minutes every hour. When the standard clock is half past three, this clock aligns with the standard clock. Now the standard time is ten o'clock. How long will it take for this clock to go to half past ten?
一只闹钟每小时慢4分钟，标准钟三点半时，此钟与标准钟对准，现在标准时间是十点钟，问经过多少时间后，这只钟才能走到十点半？
<gadget id="calculator">4 * 7</gadget>
<output>28</output>

<gadget id="calculator">60 - 4</gadget>
<output>56</output>

<gadget id="calculator">56 / 60</gadget>
<output>14/15 = around 0.933333</output>

<gadget id="calculator">28 / (14/15)</gadget>
<output>30</output>

<result>30</result>