A plane flies from point A to point B and back to point A. Fly 1,500 kilometers per hour when going there, fly 1,000 kilometers per hour when returning, and take 6 hours to go back and forth. So how far is the distance between A and B?
一架飞机从A地飞到B地，再返回A地．去时每小时飞1500千米，返回时每小时飞1000千米，来回共用6小时．那么A、B相距多少千米．
<gadget id="calculator">1_000 * 6</gadget>
<output>6_000</output>

<gadget id="calculator">1_500 + 1_000</gadget>
<output>2_500</output>

<gadget id="calculator">6_000 / 2_500</gadget>
<output>12/5 = around 2.4</output>

<gadget id="calculator">1_500 * (12/5)</gadget>
<output>3_600</output>

<result>3_600</result>