Lichun and Lixia brothers set off from home to the county seat. Lichun rode a bicycle for 5 kilometers first, and then Lixia set off on a motorcycle. It happened to catch up with Lichun at the halfway between home and the county. At this time, Lichun found that something was forgotten at home. Lixia immediately rode his motorcycle back home to help Lichun get things, and then went to the county seat, and Lichun continued to ride his bicycle to the county seat, and the two brothers arrived at the county seat at the same time. Find the distance from home to the county seat. (The speed of bicycles and motorcycles is always constant)
立春和立夏兄弟俩从家里出发去县城，立春骑自行车先行了5千米后立夏再骑摩托车出发，正好在家里和县城的中点赶上立春，此时立春发现有东西忘在了家里，立夏立即骑摩托车回家帮立春取东西，然后再去县城，而立春继续骑自行车去县城，结果兄弟俩恰好同时到达县城．求家到县城的距离．(自行车与摩托车的速度始终不变)
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">1 + (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) / (1/2)</gadget>
<output>3</output>

<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">3 * (1/2)</gadget>
<output>3/2 = around 1.5</output>

<gadget id="calculator">(3/2) - (1/2)</gadget>
<output>1</output>

<gadget id="calculator">15 / 1</gadget>
<output>15</output>

<result>15</result>