Li Ming and Zhang Hua participated in the race. When Li Ming ran to the halfway point, Zhang Hua ran 40% of the distance. At this time, the distance between the two was 80 meters. Do you know how many meters the race is?
李明和张华参加赛跑，李明跑到中点时，张华跑了全程的40%，此时两人相距80米，你知道赛程多少米吗？
<gadget id="calculator">50 / 100</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">40 / 100</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(1/2) - (2/5)</gadget>
<output>1/10 = around 0.1</output>

<gadget id="calculator">80 / (1/10)</gadget>
<output>800</output>

<result>800</result>