A car drives from place A to place B. It takes 4 hours to go and 5 hours to return. What is the speed of the return equal to the speed of the journey?
一辆汽车从甲地开往乙地，去时用了4时，返回时用了5时，返回时的速度相当于去时的多少
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

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

<gadget id="calculator">(1/5) / (1/4)</gadget>
<output>4/5 = around 0.8</output>

<result>4/5 = around 0.8</result>