It took (9/10) hours for Xiaogang to walk 3 kilometers, how many hours does it take on average to walk 1 kilometer?
小刚步行3千米用了(9/10)小时，平均步行1千米需多少小时．
<gadget id="calculator">9 / 10</gadget>
<output>9/10 = around 0.9</output>

<gadget id="calculator">(9/10) / 3</gadget>
<output>3/10 = around 0.3</output>

<result>3/10 = around 0.3</result>