A military plane carries out the task of transporting earthquake relief supplies from A to B. The original planned flight speed is 9 km/min. Due to the urgency of the mission, the actual flight speed was 3 km/min higher than the plan, and the result was that it arrived at B half an hour earlier than the plan. So how many kilometers is the route distance between A and B?
一架军用飞机从甲地向乙地执行运送抗震救灾物资的任务，原计划飞行速度是9千米/分．由于任务紧急，实际飞行速度比计划多3千米/分，结果比计划提前半小时到达乙地．那么甲、乙两地的航线距离是多少千米？
<gadget id="calculator">9 * 30</gadget>
<output>270</output>

<gadget id="calculator">3 * 30</gadget>
<output>90</output>

<gadget id="calculator">270 + 90</gadget>
<output>360</output>

<gadget id="calculator">3 - 9</gadget>
<output>-6</output>

<gadget id="calculator">9 + (-6)</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>