The distance between A and B is 20 kilometers. A and B start from A to B at the same time. A rides a bicycle for 10 kilometers per hour, and B walks for 5 kilometers per hour. A stops for repairs on the way, and B arrives After point B, A has to ride another 2 kilometers to get to point B. How long does it take for A to repair the car?
AB两地相距20千米，甲乙两人同时出发从A地去B地，甲骑自行车每小时行10千米，乙步行每小时5千米，甲在中途停车修理了一段时间，乙到达了B地后，甲再骑车行2千米才能到达B地，求甲修车用了多少时间？
<gadget id="calculator">20 / 5</gadget>
<output>4</output>

<gadget id="calculator">2 / 10</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) - 2</gadget>
<output>-9/5 = around -1.8</output>

<gadget id="calculator">4 + (-9/5)</gadget>
<output>11/5 = around 2.2</output>

<result>11/5 = around 2.2</result>