and B start from A and B and walk toward each other. A starts 1 hour first, and they meet 4 hours after B starts. It is known that A travels 2 kilometers more per hour than B, and the meeting point is 10 kilometers away from the midpoint of AB, then how many kilometers are the distance between AB and AB?
甲、乙两人从A、B两地出发相向而行，甲先出发1小时，两人在乙出发4小时后相遇．已知甲比乙每小时多行2千米，而相遇地点距离AB的中点10千米，则AB两地相距多少千米．
<gadget id="calculator">10 * 2</gadget>
<output>20</output>

<gadget id="calculator">2 * 4</gadget>
<output>8</output>

<gadget id="calculator">20 - 8</gadget>
<output>12</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">10 + 12</gadget>
<output>22</output>

<gadget id="calculator">22 * 4</gadget>
<output>88</output>

<gadget id="calculator">88 + 12</gadget>
<output>100</output>

<result>100</result>