Walk a certain distance. On the first day, I traveled the whole distance (2/5), and on the second day, I traveled 70 kilometers. The ratio of the distance traveled in two days to the total distance is 3:4. How long is this distance?
行一段路，第一天行了全程的(2/5)，第二天行了70千米，两天行的路程与总路程的比是3：4，这段路多长？
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

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

<gadget id="calculator">(3/4) - (2/5)</gadget>
<output>7/20 = around 0.35</output>

<gadget id="calculator">70 / (7/20)</gadget>
<output>200</output>

<result>200</result>