Uncle Zhang walks 6 kilometers per hour from the township government to the county seat, and Uncle Li walks 4 kilometers per hour from the county seat to the township government. When the central points meet, how many kilometers is the distance from the township government to the county seat?
张叔叔由乡政府到县城，每小时走6千米，李伯伯由县城到乡政府，每小时走4千米，如果李伯伯比张叔叔先走1小时，他们恰好在乡政府和县城间的中心点相遇，乡政府到县城有多少千米？
<gadget id="calculator">6 + 4</gadget>
<output>10</output>

<gadget id="calculator">6 - 4</gadget>
<output>2</output>

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

<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">4 * 1</gadget>
<output>4</output>

<gadget id="calculator">20 + 4</gadget>
<output>24</output>

<result>24</result>