To build a road, the ratio of the length of the repaired to the unrepaired is 1:5. If another 30 meters are repaired, the repaired part is unrepaired (3/5). How long is this road?
修一条公路，已修和未修长度的比是1：5，如果再修30米，则已修的是未修的(3/5)，这条公路有多长？
<gadget id="calculator">1 / 24</gadget>
<output>1/24 = around 0.041667</output>

<gadget id="calculator">30 / (1/24)</gadget>
<output>720</output>

<result>720</result>