A plane flies from A to B with a planned speed of 12 km. Due to the change of the mission, the actual flight speed is 9 km/min, and the frame formation is half an hour later than planned to arrive at B. Find the distance between A and B.
一架飞机从甲地飞往乙地，原计划速度是12千米分．因任务改变，实际飞行速度是9千米/分，结架比计划延后半小时到达乙地．求甲、乙两地的距离．
<gadget id="calculator">30 * 12</gadget>
<output>360</output>

<gadget id="calculator">12 - 9</gadget>
<output>3</output>

<gadget id="calculator">360 / 3</gadget>
<output>120</output>

<gadget id="calculator">120 * 9</gadget>
<output>1_080</output>

<result>1_080</result>