A passenger car and a truck leave opposite places A and B at the same time. When they meet, they are 30 kilometers away from the midpoint. The passenger car travels 4 kilometers more than the truck per hour, and the truck travels 56 kilometers per hour. Find the distance between A and B in kilometers ?
客车和货车同时从甲、乙两地相对开出，相遇时离中点30千米，客车每小时比货车多行4千米，货车每小时行56千米，求甲乙两地相距多少千米？
<gadget id="calculator">56 + 4 + 56</gadget>
<output>116</output>

<gadget id="calculator">2 / 4</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">30 * (1/2)</gadget>
<output>15</output>

<gadget id="calculator">116 * 15</gadget>
<output>1_740</output>

<result>1_740</result>