Two teams, A and B, build a road. Team A builds (3/5) the length of the road, and Team B takes up (2/5) the length of the road. Team A builds 4 kilometers more than Team B. The road How many kilometers is the total length?
甲、乙两队修一条公路，甲队修了公路长的(3/5)，乙队修的长度占公路长的(2/5)，甲队比乙队多修4千米，这条公路全长多少千米？
<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">2 / 5</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">(3/5) - (2/5)</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">4 / (1/5)</gadget>
<output>20</output>

<result>20</result>