A passenger train travels 90 kilometers per hour, and it takes 12 hours to travel from city A to city B. The length of the railway from city B to city C is 450 kilometers. So how long is the railway from City A to City C via City B?
一列客车每小时行驶90千米，从甲城到乙城要行驶12小时，从乙城到丙城的铁路长450千米．那么从甲城经乙城到丙城的铁路长多少千米？
<gadget id="calculator">90 * 12</gadget>
<output>1_080</output>

<gadget id="calculator">1_080 + 540</gadget>
<output>1_620</output>

<result>1_620</result>