An engineering team repairs a road and completes it in groups. One group repairs the full length (9/20), and the second group repairs 24 kilometers less than the first group, and only repairs the full length (3/10). How much is this road? km?
一个工程队修一条路，分小组完成，一组修了全长的(9/20)，二组比一组少修24千米，只修了全长的(3/10)，这条路有多少千米？
<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">24 / (3/20)</gadget>
<output>160</output>

<result>160</result>