A highway was built on the first day (1/7), and on the second day it was repaired 16 meters less than on the first day. At this time, the ratio of the number of meters repaired to the length of this road is 2:9, and the length of this road is How much rice?
修一条公路，第一天修了(1/7)，第二天比第一天少修16米，这时已修的米数与这条公路的长的比是2：9，这条公路长多少米？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">2 / 9</gadget>
<output>2/9 = around 0.222222</output>

<gadget id="calculator">(2/9) - (1/7)</gadget>
<output>5/63 = around 0.079365</output>

<gadget id="calculator">(1/7) - (5/63)</gadget>
<output>4/63 = around 0.063492</output>

<gadget id="calculator">16 / (4/63)</gadget>
<output>252</output>

<result>252</result>