Someone walks a distance in three days, the first day (2/5) walks the remaining 30% of the distance, and the third day walks 6,000 more than the 75% of the first day rice. How many kilometers is the total length of this section?
某人用三天走完一段路，第一天走了这段路的(2/5)，第二天走了余下的30%，第三天走的比第一天的75%多6千米．求这段全长多少千米？
<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">1 - (2/5)</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">30 / 100</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">(3/5) * (3/10)</gadget>
<output>9/50 = around 0.18</output>

<gadget id="calculator">75 / 100</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(2/5) * (3/4)</gadget>
<output>3/10 = around 0.3</output>

<gadget id="calculator">1 - (2/5) - (9/50) - (3/10)</gadget>
<output>3/25 = around 0.12</output>

<gadget id="calculator">6 / (3/25)</gadget>
<output>50</output>

<result>50</result>