People's Liberation Army soldiers have to repair the dam when the flood keeps destroying the dam. If it takes 45 minutes for 10 people and 20 minutes for 20 people, how many minutes will it take for 14 people to repair the dam?
解放军战士在洪水不断冲毁大坝的过程中要修好大坝，若10人需45分钟，20人需要20分钟，则14人修好大坝需多少分钟．
<gadget id="calculator">45 * 10</gadget>
<output>450</output>

<gadget id="calculator">10 * 45</gadget>
<output>450</output>

<gadget id="calculator">20 * 20</gadget>
<output>400</output>

<gadget id="calculator">450 - 400</gadget>
<output>50</output>

<gadget id="calculator">45 - 20</gadget>
<output>25</output>

<gadget id="calculator">50 / 25</gadget>
<output>2</output>

<gadget id="calculator">2 * 45</gadget>
<output>90</output>

<gadget id="calculator">450 - 90</gadget>
<output>360</output>

<gadget id="calculator">14 - 2</gadget>
<output>12</output>

<gadget id="calculator">360 / 12</gadget>
<output>30</output>

<result>30</result>