Hangzhou Canal Cruise has a voyage of 54 kilometers from Pujia Station to Gongchenqiao Station. "Bei" met on the way, and asked: How many meters can "Jianbei" sail per minute?
杭州运河游船从濮家站到拱宸桥站航程54千米，"中北号"和"建北号"相对开出，其中"中北号"每分钟航行1000米，30分钟时与"建北号"在途中相遇，问："建北号"每分钟能航行多少米？
<gadget id="calculator">54 * 1_000</gadget>
<output>54_000</output>

<gadget id="calculator">54_000 / 30</gadget>
<output>1_800</output>

<gadget id="calculator">1_800 - 1_000</gadget>
<output>800</output>

<result>800</result>