Xiaohua (3/4) walks 3 kilometers at an hour, how many hours does it take to walk 1 kilometer according to this calculation? What is the formula.
小花(3/4)时行走3千米，照这样计算，行走1千米要多少小时？算式是多少．
<gadget id="calculator">3 / 4</gadget>
<output>3/4 = around 0.75</output>

<gadget id="calculator">(3/4) / 3</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / (1/4)</gadget>
<output>4</output>

<result>1/4 = around 0.25</result>