Mingming walks 3 kilometers in 1 hour. On average, he walks ((())/(())) kilometers per minute. How many minutes does it take to walk 1 kilometer?
铭铭1小时走3千米，平均每分钟走((())/(()))千米，走1千米需多少分钟．
<gadget id="calculator">1 / 20</gadget>
<output>1/20 = around 0.05</output>

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

<result>20</result>