certain army conducts field training, marches overnight, and walks the whole journey (4/9), and there is still 10km away from the midpoint. How many kilometers does it need to walk in the whole journey?
某部队进行野战训练，连夜急行军，走了全程的(4/9)，离中点还有10km，全程需走多少千米？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 / 9</gadget>
<output>4/9 = around 0.444444</output>

<gadget id="calculator">(1/2) - (4/9)</gadget>
<output>1/18 = around 0.055556</output>

<gadget id="calculator">10 / (1/18)</gadget>
<output>180</output>

<result>180</result>