It takes 60 days for engineering team A to repair a section of highway alone, and 75 days for engineering team B to repair it alone. After 20 days of repairing by engineering team A, engineering team B starts repairing from the other end. After 15 days, the distance between the two engineering teams is still 1,300 meters. How many kilometers is this road?
一段公路，甲工程队单独修要60天，乙工程队单独修要75天，甲工程队修了20天后，乙工程队从另一端开始修，15天后两工程队还相距1千3百米，求这段公路长多少千米？
<gadget id="calculator">1 / 60</gadget>
<output>1/60 = around 0.016667</output>

<gadget id="calculator">(1/60) * 20</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">1 / 75</gadget>
<output>1/75 = around 0.013333</output>

<gadget id="calculator">(1/60) + (1/75)</gadget>
<output>3/100 = around 0.03</output>

<gadget id="calculator">(3/100) * 15</gadget>
<output>9/20 = around 0.45</output>

<gadget id="calculator">1 - (1/3) - (9/20)</gadget>
<output>13/60 = around 0.216667</output>

<gadget id="calculator">1.3 / (13/60)</gadget>
<output>6</output>

<result>6</result>