Two passenger and freight vehicles depart from the east and west cities opposite each other at the same time, and meet each other in 12 hours. At this time, the truck is still 480 kilometers away from the east city. It is known that the bus will take 30 hours to travel from the east city to the west city. After the two vehicles arrive at the west and east cities, They both stayed for 1 hour, each went back, from the first meeting to the meeting again on the way, how many hours have passed?
客货两车同时从东西两城相对开出，12小时相遇，这时货车离东城还有480千米，已知客车从东城到西城需行30小时，两车到达西、东两城后，都停留1小时候，各自返回，从第一次相遇到途中再相遇，经过多少小时？
<gadget id="calculator">480 / 12</gadget>
<output>40</output>

<gadget id="calculator">40 * 30 * 2</gadget>
<output>2_400</output>

<gadget id="calculator">30 - 12</gadget>
<output>18</output>

<gadget id="calculator">18 / 12</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">40 * (3/2)</gadget>
<output>60</output>

<gadget id="calculator">40 + 60</gadget>
<output>100</output>

<gadget id="calculator">2_400 / 100</gadget>
<output>24</output>

<gadget id="calculator">24 + 1</gadget>
<output>25</output>

<result>25</result>