Obviously walk (9/10) kilometers in (3/20) hours, find out how many hours it will take to travel 1 kilometer. What should be the column
明明(3/20)小时走了(9/10)千米，求明明行1千米需要多少小时．列式应是多少
<gadget id="calculator">3 / 20</gadget>
<output>3/20 = around 0.15</output>

<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(3/20) / (9/10)</gadget>
<output>1/6 = around 0.166667</output>

<result>1/6 = around 0.166667</result>