Traveling a certain distance, the ratio of time spent by A and B is 4:5, and A's speed is B's.
行一段路，甲乙两人所用的时间的比是4：5，甲的速度是乙的多少．
<gadget id="calculator">1 / 4</gadget>
<output>1/4 = around 0.25</output>

<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">(1/4) / (1/5)</gadget>
<output>5/4 = around 1.25</output>

<result>5/4 = around 1.25</result>