An airplane flies 23 kilometers per minute, and it takes half an hour to fly from city A to city B. How far is it from city A to city B?
一架飞机每分飞行23千米，从A城市到B城市要飞行半小时．从A城市到B城市的距离有多远？
<gadget id="calculator">23 * 30</gadget>
<output>690</output>

<result>690</result>