From city A to city B, A needs to travel for 5 hours, and B needs to travel for 4 hours. What is the speed of A at the speed of B?
从A城到B城，甲要行5小时，乙要行4小时，甲的速度是乙的多少．
<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>