my country's island coastline is about 14000km long, which is longer than the mainland coastline (7/9); the mainland coastline is longer than the land boundary line (9/11). How long is my country's land boundary in km?
我国岛屿海岸线长约14000km，是大陆海岸线长的(7/9)；大陆海岸线长是陆地边界线长的(9/11)．我国陆地边界线长多少km？
<gadget id="calculator">7 / 9</gadget>
<output>7/9 = around 0.777778</output>

<gadget id="calculator">9 / 11</gadget>
<output>9/11 = around 0.818182</output>

<gadget id="calculator">14_000 / (7/9) / (9/11)</gadget>
<output>22_000</output>

<result>22_000</result>