A cargo ship sails from port A to port B, traveling an average of 400 kilometers per day, and after 2 days of driving, it is still 1200 kilometers away from port B. How many miles is the distance between A and B?
一艘货轮从甲港驶往乙港，平均每天行驶400千米，行驶2天后距离乙港还有1200千米．甲、乙两港相距多少千米？
<gadget id="calculator">400 * 2</gadget>
<output>800</output>

<gadget id="calculator">800 + 1_200</gadget>
<output>2_000</output>

<result>2_000</result>