A and B both start from A to B at the same time. After A arrives at B, he immediately goes back the same way and meets B at a distance of 28 kilometers from B. It is known that A travels 20 kilometers per hour and B travels 13 kilometers per hour. How many kilometers are there between A and B?
甲乙二人同时从A地出发去B地．甲到达B地后立即按原路返回，在距B地28千米处与乙相遇．已知甲每小时行20千米，乙每小时行13千米．A、B两地相距多少千米？
<gadget id="calculator">28 * 2</gadget>
<output>56</output>

<gadget id="calculator">20 - 13</gadget>
<output>7</output>

<gadget id="calculator">56 / 7</gadget>
<output>8</output>

<gadget id="calculator">20 * 8</gadget>
<output>160</output>

<gadget id="calculator">160 - 28</gadget>
<output>132</output>

<result>132</result>