In order to meet the Asian Games held in Guangzhou in November 2010, an engineering team actually built 3 kilometers more athletes-only roads than originally planned. How many kilometers?
为迎接2010年11月在广州举办的亚运会，一个工程队实际比原计划多修了3千米的运动员专用道路，已知原计划修的道路千米数只占实际的85%，原计划修多少千米？
<gadget id="calculator">85 / 100</gadget>
<output>17/20 = around 0.85</output>

<gadget id="calculator">1 - (17/20)</gadget>
<output>3/20 = around 0.15</output>

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

<gadget id="calculator">20 - 3</gadget>
<output>17</output>

<result>17</result>