There is a part of water leaking into a ship that has run aground. If 12 people are sent to carry the sea water out of the ship, all the water can be transported out in 3 hours. If 5 people are sent, it will take 10 hours. How many people are needed to complete it in 1 hour? (When the water is being transported out of the boat, the boat is also taking in water, and everyone is transporting water at the same speed.)
现有一艘轮船由于触礁船里漏进一部分水，如果派12人来将海水往船外运水，3小时可将水全部运出，若派出5人，则需要10小时，问如果要在2小时内完成需要多少人？(将水往船外运的时候船也在进水，每个人运水的速度相同．)
<gadget id="calculator">12 * 3</gadget>
<output>36</output>

<gadget id="calculator">5 * 10</gadget>
<output>50</output>

<gadget id="calculator">50 - 36</gadget>
<output>14</output>

<gadget id="calculator">10 - 3</gadget>
<output>7</output>

<gadget id="calculator">14 / 7</gadget>
<output>2</output>

<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<gadget id="calculator">36 - 6</gadget>
<output>30</output>

<gadget id="calculator">2 * 2</gadget>
<output>4</output>

<gadget id="calculator">30 + 4</gadget>
<output>34</output>

<gadget id="calculator">34 / 2</gadget>
<output>17</output>

<result>17</result>