The speed of the passenger car is 72 kilometers per hour, and the speed of the truck is 60 kilometers per hour. Two trains are running towards each other. The length of each carriage of the truck is 10 meters. 60% iron ore, the driver of the bus found that it took 12 seconds for the truck to pass by him, and asked how many tons of iron ore the truck contained.
客车速度每小时72千米，货车速度每小时60千米，两列火车相向而行，货车每节车厢长10米，火车头与车尾的长相当于两节车厢，每节车厢装50吨含铁60%的铁矿石，客车司机发现这列货车从他身边过时共花时间12秒，问这货车装的铁矿石共可炼铁多少吨．
<gadget id="calculator">72_000 / 3_600</gadget>
<output>20</output>

<gadget id="calculator">60_000 / 3_600</gadget>
<output>50/3 = around 16.666667</output>

<gadget id="calculator">20 + (50/3)</gadget>
<output>110/3 = around 36.666667</output>

<gadget id="calculator">12 * (110/3)</gadget>
<output>440</output>

<gadget id="calculator">440 - 10 - 10</gadget>
<output>420</output>

<gadget id="calculator">420 / 10</gadget>
<output>42</output>

<gadget id="calculator">42 * 50</gadget>
<output>2_100</output>

<gadget id="calculator">60 / 100</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2_100 * (3/5)</gadget>
<output>1_260</output>

<result>1_260</result>