The distance between A and B is 18km. It took Xiaojun 6h to walk the whole journey. How many hours does it take on average to walk 1km?
甲乙两地相距18km，小军步行全程用了6h，行1km平均要用多少h．
<gadget id="calculator">6 / 18</gadget>
<output>1/3 = around 0.333333</output>

<result>1/3 = around 0.333333</result>