From point A to point B, it takes 5 hours for A and 4 hours for B, what is the speed ratio of A and B?
从A地到B地，甲要5小时，乙要4小时，甲、乙的速度比是多少．
<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>