A road repair team repaired a road. On the first day, it repaired the full length (3/10), and on the second day it repaired the full length (9/20). The second day was 72 meters longer than the first day. This road has how long?
某修路队修一条公路，第一天修了全长的(3/10)，第二天修了全长的(9/20)，第二天比第一天多修72米，这条公路有多长？
<gadget id="calculator">9 / 20</gadget>
<output>9/20 = around 0.45</output>

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

<gadget id="calculator">(9/20) - (3/10)</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">72 / (3/20)</gadget>
<output>480</output>

<result>480</result>