The total length of the Yangtze River is 6300 kilometers, which is 900 kilometers longer than that of the Yellow River. How many kilometers is the total length of the Yellow River?
长江全长是6300千米，比黄河长900千米，黄河全长多少千米？
<gadget id="calculator">6_300 - 900</gadget>
<output>5_400</output>

<result>5_400</result>