To build a road, the full length (1/3) is built on the first day, and 30 meters are built on the second day. At this time, the ratio of the repaired part to the remaining part is 3:4. How many meters is the total length of this road?
修一条路，第一天修了全长的(1/3)，第二天修了30米，这时已修的和剩下的比是3：4，这条路全长多少米？
<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(3/7) - (1/3)</gadget>
<output>2/21 = around 0.095238</output>

<gadget id="calculator">30 / (2/21)</gadget>
<output>315</output>

<result>315</result>